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This patch removes an overly conservative check that would prevent simplifying copies when the value we were tracking would go through several subregister indices. Indeed, the intend of this check was to not track values whenever we have to compose subregister, but actually what the check was doing was bailing anytime we see a second subreg, even if that second subreg would actually be the new source of truth (as opposed to a part of that subreg). Differential Revision: https://reviews.llvm.org/D59891 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357095 91177308-0d34-0410-b5e6-96231b3b80d8
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