Add TargetOptions and use it when constructing targets.
 - This ended up being hard to factor, sorry for the large diff.

 - Some post-commit cleanup to come.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@88833 91177308-0d34-0410-b5e6-96231b3b80d8
16 files changed