Eric Fiselier da8f9b5b1b [coroutines] Fix fallthrough diagnostics for coroutines ...

Summary:
This patch fixes a number of issues with the analysis warnings emitted when a coroutine may reach the end of the function w/o returning.

* Fix bug where coroutines with `return_value` are incorrectly diagnosed as missing `co_return`'s.
* Rework diagnostic message to no longer say "non-void coroutine", because that implies the coroutine doesn't have a void return type, which it might. In this case a non-void coroutine is one who's promise type does not contain `return_void()`

As a side-effect of this patch, coroutine bodies that contain an invalid coroutine promise objects are marked as invalid.

Reviewers: GorNishanov, rsmith, aaron.ballman, majnemer

Reviewed By: GorNishanov

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D33532

llvm-svn: 303831

2017-05-25 02:16:53 +00:00

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