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glsl-1.30: Test uint to float conversion of sign extended value

Ian Romanick requested to merge idr/piglit:review/optimize_extract_to_float into main

Intel compiler has a very old optimization for various combination of u2f or i2f of an extract_* source. However, the variations that do u2f of an extract_i* are incorrect.

Intel drivers with the known bug will produce blue.

A fix is currently in testing.

Edited by Ian Romanick

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