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[Coroutine] Relax CoroElide musttail check

Authored by lxfind on Feb 18 2021, 7:36 PM.

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[Coroutine] Relax CoroElide musttail check

As discussed in D94834, we don't really need to do complicated analysis. It's safe to just drop the tail call attribute.

Differential Revision: https://reviews.llvm.org/D96926

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