Driver: Fix a number of -fapple-kext issues:
 - Disable RTTI.
 - Disable use of __cxa_atexit.
 - Disable unwind tables.
 - Enable freestanding mode.

Also, honor -fhosted correctly.

<rdar://problem/7515383> C++ support: -fapple-kext not honored

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99041 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed