Both of these subtargets have functions that check whether or
not the target is mach-o. Use them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223420 91177308-0d34-0410-b5e6-96231b3b80d8
Rename the x86 isTargetMacho to isTargetMachO for uniformity.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223421 91177308-0d34-0410-b5e6-96231b3b80d8