[PATCH] D24242: [Coroutines] Part13: Handle single edge PHINodes across suspends

[Gor Nishanov via llvm-commits]

GorNishanov created this revision.
GorNishanov added a reviewer: majnemer.
GorNishanov added a subscriber: llvm-commits.
Herald added a subscriber: mehdi_amini.

If one of the uses of the value is a single edge PHINode, handle it.

Original:

    %val = something
    <suspend>   
    %p = PHINode [%val]

After Spill + Part13:

    %val = something
    %slot = gep val.spill.slot
    store %val, %slot
    <suspend>
    %p = load %slot

Plus tiny fixes/changes:
   * use correct index for coro.free in CoroCleanup
   * fixup id parameter in coro.free to allow authoring coroutine in plain C with __builtins

https://reviews.llvm.org/D24242

Files:
  lib/Transforms/Coroutines/CoroCleanup.cpp
  lib/Transforms/Coroutines/CoroEarly.cpp
  lib/Transforms/Coroutines/CoroFrame.cpp
  test/Transforms/Coroutines/phi-coro-end.ll

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