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[AMDGPU][GlobalISel] Fold flat vgpr + constant addresses

Authored by sebastian-ne on Dec 22 2020, 4:53 AM.

Description

[AMDGPU][GlobalISel] Fold flat vgpr + constant addresses

Use getPtrBaseWithConstantOffset in selectFlatOffsetImpl to fold more
vgpr+constant addresses.

Differential Revision: https://reviews.llvm.org/D93692