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Summary: This is an NFC refactoring change as a precursor to the actual fix for rematerializing in presence of phi. https://reviews.llvm.org/D24399 Pasted from review: findRematerializableChainToBasePointer changed to return the root of the chain. instead of true or false. move the PHI matching logic into the caller by inspecting the root return value. This includes an assertion that the alternate root is in the liveset for the call. Tested with current RS4GC tests. Reviewers: reames, sanjoy Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D24780 llvm-svn: 282023
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