Workaround for collision between enum members in LLVM's MachO.h and system headers
on Mac OS X (in particular mach/machine.h).

<rdar://problem/16494607>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@205480 91177308-0d34-0410-b5e6-96231b3b80d8