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glsl-1.10: Verify sign multiplied by a value with negation, absolute value, or both

Ian Romanick requested to merge idr/piglit:review/fsign-times-neg-abs into master

Both of the tests involving abs() fail on all versions of i965 that include 06d2c116415 ("intel/fs: Add a scale factor to emit_fsign"). The negation test would also fail, but an algebraic optimization moves the negation thereby masking the bug. Changes in mesa!1359 (merged) can reveal this bug.

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