[libclang] Make sure we don't ever leave a StoredDiagnostic associated with
a SourceManager that has already been deleted, rdar://10768346.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149532 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed