Driver: Add a --rtlib={compiler-rt,libgcc} argument which I plan to use to allow
dual support for compiler-rt on Linux, during bringup.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@146094 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed