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[AMDGPU] Enable output modifiers for double precision instructions

Authored by bcahoon on Mar 25 2021, 1:26 PM.

Description

[AMDGPU] Enable output modifiers for double precision instructions

Update SIFoldOperands pass to recognize v_add_f64 and v_mul_f64
instructions for folding output modifiers.

Differential Revision: https://reviews.llvm.org/D99505

Details