[Patch Darwin/PPC] implement out-of-line FPR/GPR saves/restores.

[Mike Stump]

On Oct 14, 2011, at 2:05 AM, Iain Sandoe wrote:
> This implements their use and also the GPRs - the latter makes an appreciable reduction in code size,

> OK for trunk?

Ok.  Watch for problems with async stack walking (hitting sample in Activity Monitor, or the walking done by CrashReporter)...  that's the only thing I can think of that might be strange.