Fix a bug in the following scenario.
1. llvm is built with objroot = OBJ and installed.
2. OBJ is deleted or install tree is shipped.
3. llvm-config is run.

In this scenario, llvm-config shouldn't emit an error message at #3, it
should just know it's not running in the objdir :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28704 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed