[llvm] r278170 - Add a platform independent version of __PRETTY_FUNCTION__.

[Joerg Sonnenberger via llvm-commits]

On Wed, Aug 10, 2016 at 10:17:22PM +0000, Zachary Turner wrote:
> __GNUC__ will be defined for GCC but __clang__ will not, right?

clang defines both, GCC only the former. So checking for the former
covers both.

Joerg