Yaxun (Sam) Liu 3f4b5893ef [AMDGPU] Add option -munsafe-fp-atomics ...

Add an option -munsafe-fp-atomics for AMDGPU target.

When enabled, clang adds function attribute "amdgpu-unsafe-fp-atomics"
to any functions for amdgpu target. This allows amdgpu backend to use
unsafe fp atomic instructions in these functions.

Differential Revision: https://reviews.llvm.org/D91546

2020-11-16 21:52:12 -05:00

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