Tell the diagnostic client about starting and ending source files when automatically creating chained PCHs. This way, we don't get a crash whenever a diagnostic is emitted while processing the include.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@128663 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed