[PATCH] D24408: [Coroutines] Part14: Handle coroutines with no suspend points.

[Gor Nishanov via llvm-commits]

GorNishanov created this revision.
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If coroutine has no suspend points, remove heap allocation and turn a coroutine into a normal function.

Also, if a pattern is detected that coroutine resumes or destroys itself prior to coro.suspend call, turn the suspend point into a simple jump to resume or cleanup label. This pattern occurs when coroutines are used to propagate errors in functions that return expected<T>.

https://reviews.llvm.org/D24408

Files:
  lib/Transforms/Coroutines/CoroInstr.h
  lib/Transforms/Coroutines/CoroSplit.cpp
  test/Transforms/Coroutines/no-suspend.ll

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