Improve end check on rs6000 prologue analyzer

[Mark Kettenis]

> Date: Mon, 12 Mar 2007 17:08:56 -0400
> From: Daniel Jacobowitz <drow@false.org>
> 
> On Mon, Mar 12, 2007 at 10:02:08PM +0100, Mark Kettenis wrote:
> > Ah, I think I've seen this before.  On OpenBSD the tty subsystem does
> > tab expansion, wheras on Linux this doesn't happen by default.  So we
> > must match spaces as well as tabs here.  I think that means the second
> > pattern is really redundant.  How about the attached patch?
> 
> Yeesh!  I didn't know that.  Is there somewhere we could write it down
> for test writers who make this same mistake, maybe?  I would have
> merrily written tests that expected the tab :-(

Hmm, I'm not sure we have any documentation on this.  Eli, do you know
a good location to put this info.

> 
> Your patch looks right to me.  I know that I hit the "step over
> initial brace" on all platforms on a regular basis - it's not like
> this is a new problem.  But letting it pass is probably relatively
> newer than the IRIX-specific xfail.

Comitted.

Daniel, this means that as far as I am concerned this patch can go in.

Mark