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The interesting case is what happens when you inline a musttail call through a musttail call site. In this case, we can't break perfect forwarding or allow any stack growth. Instead of merging control flow from the inlined return instruction after a musttail call into the body of the caller, leave the inlined return instruction in the caller so that the musttail call stays in the tail position. More work is required in http://reviews.llvm.org/D3630 to handle the case where the inlined function has dynamic allocas or byval arguments. Reviewers: chandlerc Differential Revision: http://reviews.llvm.org/D3491 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208910 91177308-0d34-0410-b5e6-96231b3b80d8