Switch to using -fsjlj-exceptions instead of hard-coding it. Notably, this fixes
calls to the UnwindResumeOrRethrow function for C++/Obj-C exception handling,
for Darwin ARM.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95787 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed