Test preprocessor defines for NetBSD/ARM.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208718 91177308-0d34-0410-b5e6-96231b3b80d8
Add __ARM_DWARF_EH__ to signify the use of Itanium ABI for unwind
instructions.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@208719 91177308-0d34-0410-b5e6-96231b3b80d8