Merging r292561:

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r292561 | rsmith | 2017-01-19 17:19:46 -0800 (Thu, 19 Jan 2017) | 3 lines

PR31701: Fix crash on invalid caused by parsing a dependent initializer when we
don't know we're in a dependent context.

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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_40@293297 91177308-0d34-0410-b5e6-96231b3b80d8