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As we're becoming stricter w/ respect to not allowing vregs having LLTs and regclasses assigned both mid-globalisel pipeline, the number of extra copies grows, some of which separate G_UNMERGE's from their corresponding G_MERGE's, becoming a performance concern. It's worth mentioning that we're already looking through copies while combining legalization artifacts for every kind of artifact but G_UNMERGE. Reviewed By: aditya_nandakumar Reviewers: ab, t.p.northover, volkan, javed.absar Subscribers: rovka, kristof.beyls, llvm-commits Differential Revision: https://reviews.llvm.org/D45644 llvm-svn: 330660
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