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Summary: When combining COPY instructions, we were replacing the destination registers with the source register without checking register constraints. This patch adds a simple logic to check if the constraints match before replacing registers. Reviewers: qcolombet, aditya_nandakumar, aemerson, paquette, dsanders, Petar.Avramovic Reviewed By: aditya_nandakumar Subscribers: rovka, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D70616
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