Fix crash when both ExpectAndConsume and ConsumeAnyToken emit diagnostics

The DiagnosticBuilder's lifetime in parser typo recovery was overlapping with
the subsequent consume which can itself emit PP diagnostics.

Patch by Olivier Goffart!

git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@201965 91177308-0d34-0410-b5e6-96231b3b80d8