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[AMDGPU] Allow index optimisation in SIPreEmitPeephole for bundles

Authored by critson on Mar 19 2021, 6:03 PM.

Description

[AMDGPU] Allow index optimisation in SIPreEmitPeephole for bundles

Add code so duplication index register changes can be removed from
inside bundles.

Reviewed By: rampitec, foad

Differential Revision: https://reviews.llvm.org/D98940

Details