objective-C modern translator. More fixups for 
modern meta-data abi translation. Still wip.
// rdar://13138459


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174672 91177308-0d34-0410-b5e6-96231b3b80d8
Form the default -fmodules-cache-path= properly.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174674 91177308-0d34-0410-b5e6-96231b3b80d8