Driver: Fix forwarding of -{std,ansi,trigraphs} when there are
multiple instances of an option.

Also, removed direct -ansi support from clang-cc.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68558 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed