GLSL source for vertex shader 1:
#version 130
uniform float foo[8];
in vec4 vertex;

float gl_ClipDistance[8];

void main()
{
	gl_Position = vertex;
	gl_ClipDistance = foo;
	gl_ClipDistance = gl_ClipDistance;
}
GLSL IR for shader 1:
(
(declare (shader_in ) vec4 vertex)
(declare (uniform ) (array float 8) foo)
(declare (shader_out ) vec4 gl_Position)
(declare (shader_out ) float gl_PointSize)
(declare (shader_in ) vec4 gl_Vertex)
(declare (shader_in ) vec3 gl_Normal)
(declare (shader_in ) vec4 gl_Color)
(declare (shader_in ) vec4 gl_SecondaryColor)
(declare (shader_in ) vec4 gl_MultiTexCoord0)
(declare (shader_in ) vec4 gl_MultiTexCoord1)
(declare (shader_in ) vec4 gl_MultiTexCoord2)
(declare (shader_in ) vec4 gl_MultiTexCoord3)
(declare (shader_in ) vec4 gl_MultiTexCoord4)
(declare (shader_in ) vec4 gl_MultiTexCoord5)
(declare (shader_in ) vec4 gl_MultiTexCoord6)
(declare (shader_in ) vec4 gl_MultiTexCoord7)
(declare (shader_in ) float gl_FogCoord)
(declare (shader_out ) vec4 gl_ClipVertex)
(declare (shader_out ) vec4 gl_FrontColor)
(declare (shader_out ) vec4 gl_BackColor)
(declare (shader_out ) vec4 gl_FrontSecondaryColor)
(declare (shader_out ) vec4 gl_BackSecondaryColor)
(declare (shader_out ) float gl_FogFragCoord)
(declare (uniform ) mat4 gl_ModelViewMatrix)
(declare (uniform ) mat4 gl_ProjectionMatrix)
(declare (uniform ) mat4 gl_ModelViewProjectionMatrix)
(declare (uniform ) mat3 gl_NormalMatrix)
(declare (uniform ) mat4 gl_ModelViewMatrixInverse)
(declare (uniform ) mat4 gl_ProjectionMatrixInverse)
(declare (uniform ) mat4 gl_ModelViewProjectionMatrixInverse)
(declare (uniform ) mat4 gl_ModelViewMatrixTranspose)
(declare (uniform ) mat4 gl_ProjectionMatrixTranspose)
(declare (uniform ) mat4 gl_ModelViewProjectionMatrixTranspose)
(declare (uniform ) mat4 gl_ModelViewMatrixInverseTranspose)
(declare (uniform ) mat4 gl_ProjectionMatrixInverseTranspose)
(declare (uniform ) mat4 gl_ModelViewProjectionMatrixInverseTranspose)
(declare (uniform ) float gl_NormalScale)
(declare (uniform ) gl_LightModelParameters gl_LightModel)
(declare (uniform ) vec2 gl_BumpRotMatrix0MESA)
(declare (uniform ) vec2 gl_BumpRotMatrix1MESA)
(declare (uniform ) vec4 gl_FogParamsOptimizedMESA)
(declare () int gl_MaxLights)
(declare () int gl_MaxClipPlanes)
(declare () int gl_MaxTextureUnits)
(declare () int gl_MaxTextureCoords)
(declare () int gl_MaxVertexAttribs)
(declare () int gl_MaxVertexUniformComponents)
(declare () int gl_MaxVaryingFloats)
(declare () int gl_MaxVertexTextureImageUnits)
(declare () int gl_MaxCombinedTextureImageUnits)
(declare () int gl_MaxTextureImageUnits)
(declare () int gl_MaxFragmentUniformComponents)
(declare (uniform ) (array mat4 8) gl_TextureMatrix)
(declare (uniform ) (array mat4 8) gl_TextureMatrixInverse)
(declare (uniform ) (array mat4 8) gl_TextureMatrixTranspose)
(declare (uniform ) (array mat4 8) gl_TextureMatrixInverseTranspose)
(declare (uniform ) gl_DepthRangeParameters gl_DepthRange)
(declare (uniform ) (array vec4 8) gl_ClipPlane)
(declare (uniform ) gl_PointParameters gl_Point)
(declare (uniform ) gl_MaterialParameters gl_FrontMaterial)
(declare (uniform ) gl_MaterialParameters gl_BackMaterial)
(declare (uniform ) (array gl_LightSourceParameters 8) gl_LightSource)
(declare (uniform ) gl_LightModelProducts gl_FrontLightModelProduct)
(declare (uniform ) gl_LightModelProducts gl_BackLightModelProduct)
(declare (uniform ) (array gl_LightProducts 8) gl_FrontLightProduct)
(declare (uniform ) (array gl_LightProducts 8) gl_BackLightProduct)
(declare (uniform ) (array vec4 8) gl_TextureEnvColor)
(declare (uniform ) (array vec4 8) gl_EyePlaneS)
(declare (uniform ) (array vec4 8) gl_EyePlaneT)
(declare (uniform ) (array vec4 8) gl_EyePlaneR)
(declare (uniform ) (array vec4 8) gl_EyePlaneQ)
(declare (uniform ) (array vec4 8) gl_ObjectPlaneS)
(declare (uniform ) (array vec4 8) gl_ObjectPlaneT)
(declare (uniform ) (array vec4 8) gl_ObjectPlaneR)
(declare (uniform ) (array vec4 8) gl_ObjectPlaneQ)
(declare (uniform ) gl_FogParameters gl_Fog)
(declare (uniform ) (array vec4 33) gl_CurrentAttribVertMESA)
(declare (uniform ) (array vec4 55) gl_CurrentAttribFragMESA)
(declare (shader_out ) (array vec4 0) gl_TexCoord)
(declare () int gl_MaxDrawBuffers)
(declare (sys ) int gl_VertexID)
(declare () int gl_MaxClipDistances)
(declare () int gl_MaxVaryingComponents)
(declare (shader_out ) (array float 8) gl_ClipDistance)
(function main
  (signature void
    (parameters
    )
    (
      (declare (temporary ) vec4 assignment_tmp)
      (assign  (xyzw) (var_ref assignment_tmp)  (var_ref vertex) ) 
      (assign  (xyzw) (var_ref gl_Position)  (var_ref assignment_tmp) ) 
      (declare (temporary ) (array float 8) assignment_tmp@2)
      (assign  () (var_ref assignment_tmp@2)  (var_ref foo) ) 
      (assign  () (var_ref gl_ClipDistance)  (var_ref assignment_tmp@2) ) 
      (declare (temporary ) (array float 8) assignment_tmp@3)
      (assign  () (var_ref assignment_tmp@3)  (var_ref gl_ClipDistance) ) 
      (assign  () (var_ref gl_ClipDistance)  (var_ref assignment_tmp@3) ) 
    ))

)


)


GLSL IR for linked vertex program 2:
(
(declare (shader_in ) vec4 vertex)
(declare (uniform ) (array float 8) foo)
(declare (shader_out ) vec4 gl_Position)
(declare (shader_out ) (array vec4 2) gl_ClipDistanceMESA)
(function main
  (signature void
    (parameters
    )
    (
      (declare (temporary ) vec4 assignment_tmp)
      (assign  (xyzw) (var_ref assignment_tmp)  (var_ref vertex) ) 
      (assign  (xyzw) (var_ref gl_Position)  (var_ref assignment_tmp) ) 
      (declare (temporary ) (array float 8) assignment_tmp@4)
      (assign  () (var_ref assignment_tmp@4)  (var_ref foo) ) 
      (assign  (x) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@4) (constant int (0)) ) ) 
      (assign  (y) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@4) (constant int (1)) ) ) 
      (assign  (z) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@4) (constant int (2)) ) ) 
      (assign  (w) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@4) (constant int (3)) ) ) 
      (assign  (x) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@4) (constant int (4)) ) ) 
      (assign  (y) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@4) (constant int (5)) ) ) 
      (assign  (z) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@4) (constant int (6)) ) ) 
      (assign  (w) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@4) (constant int (7)) ) ) 
      (declare (temporary ) (array float 8) assignment_tmp@5)
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (0)) )  (swiz x (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (1)) )  (swiz y (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (2)) )  (swiz z (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (3)) )  (swiz w (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (4)) )  (swiz x (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (5)) )  (swiz y (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (6)) )  (swiz z (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) ) )) 
      (assign  (x) (array_ref (var_ref assignment_tmp@5) (constant int (7)) )  (swiz w (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) ) )) 
      (assign  (x) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@5) (constant int (0)) ) ) 
      (assign  (y) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@5) (constant int (1)) ) ) 
      (assign  (z) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@5) (constant int (2)) ) ) 
      (assign  (w) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (0)) )  (array_ref (var_ref assignment_tmp@5) (constant int (3)) ) ) 
      (assign  (x) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@5) (constant int (4)) ) ) 
      (assign  (y) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@5) (constant int (5)) ) ) 
      (assign  (z) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@5) (constant int (6)) ) ) 
      (assign  (w) (array_ref (var_ref gl_ClipDistanceMESA) (constant int (1)) )  (array_ref (var_ref assignment_tmp@5) (constant int (7)) ) ) 
    ))

)


)
GLSL vertex shader 0 source for linked program 2:
#version 130
uniform float foo[8];
in vec4 vertex;

float gl_ClipDistance[8];

void main()
{
	gl_Position = vertex;
	gl_ClipDistance = foo;
	gl_ClipDistance = gl_ClipDistance;
}