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First, avoid calling setTailCall(false) on musttail calls. The funciton prototypes should be "congruent", so the shadow layout should be exactly the same. Second, avoid inserting instrumentation after a musttail call to propagate the return value shadow. We don't need to propagate the result of a tail call, it should already be in the right place. Reviewed By: eugenis Differential Revision: http://reviews.llvm.org/D4331 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215415 91177308-0d34-0410-b5e6-96231b3b80d8
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