Driver: Forward -traditional and -traditional-cpp in preprocessing modes.
 - We don't really support the majority of the horrible -traditional-cpp
   behavior, but it is unlikely that we ever will either. This allows us to
   start trying to use clang as a /usr/bin/cpp replacement and see what pieces
   of -traditional-cpp mode people actually care about.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127911 91177308-0d34-0410-b5e6-96231b3b80d8
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