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[DAG][AMDGPU][X86] Add SimplifyMultipleUseDemandedBits handling for…

Authored by RKSimon on Wed, Jul 29, 9:33 AM.

Description

[DAG][AMDGPU][X86] Add SimplifyMultipleUseDemandedBits handling for SIGN/ZERO_EXTEND + SIGN/ZERO_EXTEND_VECTOR_INREG

Peek through multiple use ops like we already do for ANY_EXTEND/ANY_EXTEND_VECTOR_INREG

Differential Revision: https://reviews.llvm.org/D84863