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Tailcalls are only OK with forwarded sret pointers. With sret demotion, they're not, as we'd have a pointer into a soon-to-be-dead stack frame. Differential Revison: http://reviews.llvm.org/D8510 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233409 91177308-0d34-0410-b5e6-96231b3b80d8