Summary: While this does not change any final output, this will greatly simplify ixing unwind destination mismatches in CFGStackify (D48345), because we have to create some new registers there. Reviewers: dschuff Subscribers: sunfish, sbc100, jgravelle-google, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D59652 llvm-svn: 357342
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