[Clang][PP] Add the __FILE_NAME__ builtin macro.

[Clang][PP] Add the __FILE_NAME__ builtin macro.

This patch adds the `__FILE_NAME__` macro that expands to the
last component of the path, similar to `__FILE__` except with
a guarantee that only the last path component (without the
separator) will be rendered.

I intend to follow through with discussion of this with WG14
as a potential inclusion in the C standard or failing that,
try to discuss this with GCC developers since this extension
is desired by GCC and Clang users/developers alike.

Differential Revision: https://reviews.llvm.org/D61756

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@360833 91177308-0d34-0410-b5e6-96231b3b80d8