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Commit 69932e4d authored by Matt Arsenault's avatar Matt Arsenault
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AMDGPU: Don't leave dead illegal VGPR->SGPR copies

Normally DCE kills these, but at -O0 these get left behind
leaving suspicious looking illegal copies.

Replace with IMPLICIT_DEF to avoid iterator issues.

llvm-svn: 327842
parent 1af12b58
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