[PATCH] D33625: [coroutines] Diagnose invalid result types for `await_resume` and `await_suspend` and add missing conversions.

[Eric Fiselier via Phabricator via cfe-commits]

EricWF created this revision.

The expression `await_ready` is required to be contextually convertible to bool and `await_suspend` must be a prvalue of either `void` or `bool`.
This patch adds diagnostics for when those requirements are violated.

It also correctly performs the contextual conversion to bool on the result of `await_ready`


https://reviews.llvm.org/D33625

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/Sema.h
  lib/Sema/SemaCoroutine.cpp
  test/SemaCXX/coroutines.cpp

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