Read/write from/to PCH the diagnostic mappings that the user set so that e.g. #pragma clang diagnostic can be used in a PCH.
Fixes rdar://8435969.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118303 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed