Produce an actual error before attempting to attach notes to it when bailing out
due to FORCE_CLANG_DIAGNOSTICS_CRASH=1. Also add a test for that env var.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171074 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed