Make Bitrig's clang understand -stdlib= correctly.
With this patch Bitrig can use a different c++ library without pain and
within the normal commandline parameters.

Original patch by David Hill, with lots of fixes and cleanup by me.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165430 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed