Adjust r194296 to not apply the alias replacement for externally

available always-inline functions. This breaks libc++'s locale
implementation. Code generation for this case should be fixed, but this
is a stop gap fix for clang 3.4.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@195501 91177308-0d34-0410-b5e6-96231b3b80d8