Add support of -x objc-cpp-output, -x objc++-cpp-output to the Driver.

Matches gcc, and is also required for using ccache with clang.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@137563 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed