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Reid Kleckner
3762a089d7
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 llvm-svn: 326404