Driver: Only add extra -L paths on darwin if they exist. Unfortunately, this
means it isn't really possible to write the test case for this code, but this is
the kind of thing that really requires testing against the installed compiler
anyway.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@100935 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed