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[AMDGPU] Update isFMAFasterThanFMulAndFAdd assumptions

Authored by critson on Jul 6 2020, 11:40 PM.

Description

[AMDGPU] Update isFMAFasterThanFMulAndFAdd assumptions

MAD/MAC is no longer always available.

Reviewed By: arsenm

Differential Revision: https://reviews.llvm.org/D83207