Move the TargetMachine MC options to MCTargetOptions. No functional
change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208832 91177308-0d34-0410-b5e6-96231b3b80d8
Unify command line handling of MCTargetOptions and remove extra
options and code. No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208833 91177308-0d34-0410-b5e6-96231b3b80d8