Add back accidentally deleted line and add test for it.

Before:
f("a", "b"
  "c");
After:
f("a", "b"
       "c");

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181980 91177308-0d34-0410-b5e6-96231b3b80d8
Fix pr15930.

In the case of inline functions, we have to special case local types
when they are used as template arguments to make sure the template
instantiations are still uniqued in case the function itself is inlined.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181981 91177308-0d34-0410-b5e6-96231b3b80d8