[Piglit] [PATCH 0/3] Fix some program input / output issues with ARB_piq

[Ian Romanick]

After spending about a week with dEQP, GL_OES_shader_io_blocks, and
GL_OES_geometry_shader, I believe there are some errors with the
expectations of our existing ARB_piq tests.  I have included spec
justifications for the changes, and the changes match tests that I have
seen in dEQP.

I would really like to know the before / after results of the updated
test on modern NVIDIA and AMD closed-source drivers.