Add support for __builtin_unwind_init.

Also, committing an #if 0'ed __builtin_setjmp and __builtin_longjmp 
implementation I've had sitting in my tree for a while.  I haven't 
enabled it because the LLVM backend support isn't complete yet.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@72727 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed