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Test cases for bugs in Mesa value range analysis optimizations

Ian Romanick requested to merge idr/piglit:review/range-analysis into master

Only the tests added by the first commit reproduced the actual bug from https://bugs.freedesktop.org/show_bug.cgi?id=111308. The others were discovered along the way. All of the cases pass on Mesa before 96fcb3f95bd, and almost all of them fail after. fs-eq-nan-tautology.shader_test is the only test that also passes after.

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