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Swiftself uses a callee-saved register. We can tail call when the register used in the caller and callee is the same. This behaviour is equivalent to that in `TargetLowering::parametersInCSRMatch`. Update call-translator-tail-call.ll to verify that we can do this. When we support inline assembly, we can write a check similar to the one in the general swiftself.ll. For now, we need to verify that we get the correct COPY instruction after call lowering. Differential Revision: https://reviews.llvm.org/D67511 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371788 91177308-0d34-0410-b5e6-96231b3b80d8
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