std::pow implementation

[Gabriel Dos Reis]

Richard Guenther <rguenth@tat.physik.uni-tuebingen.de> writes:

| for my scientific app. If this ends up the same way as the
| __attribute__((leafify)) discussion, I'll stop complaining now and instead
| just file a PR for the record.

I bet your application will benefit much more from a better inlining
support in the compiler than obfuscating the library.
(Note that it need not be a sophisticated inliner).  We get to that point
because, at some point it was decided that the compiler knows better
than the programmer.

-- Gaby