Mirko Brkusanin db6bc2ab51 [AMDGPU][GlobalISel] Fold G_FNEG above when users cannot fold mods ...

If possible fold fneg into instruction above if users cannot fold mods and we
know it will decrease instruction count.
Follows same logic as SDAG combiner in choosing opportunities to combine.

Differential Revision: https://reviews.llvm.org/D112827

2021-11-17 14:25:13 +01:00

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