bootstrap regression on sparc

[David Miller]

From: David Miller <davem@davemloft.net>
Date: Fri, 11 Nov 2011 20:41:23 -0500 (EST)

> I haven't looked more deeply at it, but the first recent suspicious change
> are the basic block handling changes Alan made two days ago:
> 
> 2011-11-09  Alan Modra  <amodra@gmail.com>
> 
> 	* function.c (bb_active_p): Delete.
 ...

I've verified that the bootstrap succeeds with this change reverted.