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f1ad5e7c9b
reserved physreg in RegisterCoalescer. Previously, we only checked for clobbers when merging into a READ of the physreg, but not when merging from a WRITE to the physreg. Differential Revision: https://reviews.llvm.org/D28527 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291942 91177308-0d34-0410-b5e6-96231b3b80d8