Update: reload register allocation patch

[Bernd Schmidt]

> I'm basically happy with the patch.  Though I do have one qeustion -- what
> happens for asm statements which have overlaps between the clobbered regs
> and the inputs/outputs?  Previously we'd get an error that we could easily
> identify.  Do we still get a reasonable message, or do we just abort?

The message has changed a bit; it now says "`asm' needs too many reloads".
This happens in spill_failure.

Bernd