Merging r308996:

Merging r308996:
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r308996 | gornishanov | 2017-07-25 11:01:49 -0700 (Tue, 25 Jul 2017) | 9 lines

[coroutines] Add serialization/deserialization of coroutines

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: EricWF, cfe-commits

Differential Revision: https://reviews.llvm.org/D35383
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_50@309954 91177308-0d34-0410-b5e6-96231b3b80d8