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[AMDGPU] Only unbundle memory accesses in SIMemoryLegalizer

Authored by critson on Mar 22 2021, 6:56 PM.

Description

[AMDGPU] Only unbundle memory accesses in SIMemoryLegalizer

This restores previous behaviour and is a step toward removing
unbundling entirely.

Reviewed By: foad, rampitec

Differential Revision: https://reviews.llvm.org/D99061

Details