System Environment:
--------------------------
Libdrm:         (master)2.4.29-3-gef20301a11afae50bfe127002913dbd0b81ddccc
Mesa:           (master)b50d250e02457f367c195ee1808b061e0dfe2d00
Xf86_video_intel:   (master)2.17.0-237-g8fc21328a0bdf87fde35d68d2b27834011acde7b

Bug detailed description:
-------------------------
run this piglit case:
[require]
GLSL >= 1.30

[fragment shader]
#version 130
precision mediump float;
void main() { gl_FragColor = gl_Color; }

[vertex shader]
#version 130
precision mediump float;
uniform sampler2D tex;
void main()
{
        gl_Position = gl_Vertex;
        gl_FrontColor = vec4(0,(textureSize(tex, 0)==ivec2(1024, 1024)),0,1);
}

[test]
texture checkerboard 0 0 (1024, 1024) (0.0, 0.0, 0.0, 0.0) (0.0, 0.0, 0.0, 0.0)
uniform int tex 0
draw rect -1 -1 2 2
relative probe rgb (0.75, 0.75) (0.0, 1.0, 0.0)

but the result as below: 
Expected: 0.000000 1.000000 0.000000
Observed: 0.000000 0.000000 0.000000

run this piglit case:
[require]
GLSL >= 1.30

[vertex shader]
#version 130
precision mediump float;
void main() { gl_Position = gl_Vertex; }

[fragment shader]
#version 130
precision mediump float;
uniform sampler2D tex;
void main()
{
        gl_FragColor = vec4(0,(textureSize(tex, 0)==ivec2(1024, 1024)),0,1);
}

[test]
texture checkerboard 0 0 (1024, 1024) (0.0, 0.0, 0.0, 0.0) (0.0, 0.0, 0.0, 0.0)
uniform int tex 0
draw rect -1 -1 2 2
relative probe rgb (0.75, 0.75) (0.0, 1.0, 0.0)

the result as below:
PIGLIT: {'result': 'pass' }

ivec2 textureSize(gsampler2D sampler, int lod) return with wrong value in vertex shader, but it works well in fragment shader.