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Summary: I put this code here, because I want to re-use it in a few other places. This supersedes some of the immediate folding code we have in SIFoldOperands. I think the peephole optimizers is probably a better place for folding immediates into copies, since it does some register coalescing in the same time. This will also make it easier to transition SIFoldOperands into a smarter pass, where it looks at all uses of instruction at once to determine the optimal way to fold operands. Right now, the pass just considers one operand at a time. Reviewers: arsenm Subscribers: wdng, nhaehnle, arsenm, llvm-commits, kzhuravl Differential Revision: https://reviews.llvm.org/D23402 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280744 91177308-0d34-0410-b5e6-96231b3b80d8
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