When LLVM is embedded in a larger application, it's not OK for LLVM to intercept crashes.  LLVM already has 
the ability to disable this functionality.  This patch exposes it via the C API.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193937 91177308-0d34-0410-b5e6-96231b3b80d8