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glsl-1.30: Add a test for bad optimizations of (a << b) << c

Ian Romanick requested to merge idr/piglit:review/left-shift-of-left-shift into master

Also add a GL_EXT_gpu_shader4 test in case someone enables that extension on older Intel GPUs that can't do OpenGL 3.0.

See also: mesa!1597 (merged)

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