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bb55f795cb
Do not replace results of `musttail` calls with a constant if the call itself can't be removed. Do not zap returns of `musttail` callees, if the call site can't be removed and replaced with a constant. Do not zap returns of `musttail`-calling blocks, this breaks invariant too. Patch by Fedor Indutny Differential Revision: https://reviews.llvm.org/D43695 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@326404 91177308-0d34-0410-b5e6-96231b3b80d8