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[AMDGPU] Add simplification/combines for llvm.amdgcn.fma.legacy

Authored by foad on Oct 23 2020, 4:52 AM.

Description

[AMDGPU] Add simplification/combines for llvm.amdgcn.fma.legacy

This follows on from D89558 which added the new intrinsic and D88955
which added similar combines for llvm.amdgcn.fmul.legacy.

Differential Revision: https://reviews.llvm.org/D90028