Arm fixes in cxa_personality.cpp and a little refactoring.
Arm fixes in cxa_personality.cpp and a little refactoring.

git-svn-id: 6a9f6578bdee8d959f0ed58970538b4ab6004734@152966 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi