[PATCH] D45860: [Coroutines] Catch exceptions in await_resume

[Brian Gesiak via Phabricator via cfe-commits]

modocache created this revision.
modocache added reviewers: GorNishanov, EricWF.

http://wg21.link/P0664r2 section "Evolution/Core Issues 24" describes a
proposed change to Coroutines TS that would have any exceptions thrown
after the initial suspend point of a coroutine be caught by the handler
specified by the promise type's 'unhandled_exception' member function.
This commit provides a sample implementation of the specified behavior.

Test Plan: `check-clang`


Repository:
  rC Clang

https://reviews.llvm.org/D45860

Files:
  lib/CodeGen/CGCoroutine.cpp
  test/CodeGenCoroutines/coro-await-resume-eh.cpp

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