[PATCH] D72709: [codegen,amdgpu] Enhance MIR DIE and re-arrange it for AMDGPU.

[Michael Liao via Phabricator via llvm-commits]

hliao added a comment.

In D72709#1820225 <https://reviews.llvm.org/D72709#1820225>, @arsenm wrote:

> I'm not sure this logic works in the presence of an undef subregister def


In SSA form, there's no subreg def.


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