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Summary: Add musttail to any resume instructions that is immediately followed by a suspend (i.e. ret). We do this even in -O0 to support guaranteed tail call for symmetrical coroutine control transfer (C++ Coroutines TS extension). This transformation is done only in the resume part of the coroutine that has identical signature and calling convention as the coro.resume call. Reviewers: GorNishanov Reviewed By: GorNishanov Subscribers: EricWF, majnemer, llvm-commits Differential Revision: https://reviews.llvm.org/D37125 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311751 91177308-0d34-0410-b5e6-96231b3b80d8