Loop clean up fixes

[Michael Hayes]

Alexandre Oliva writes:
 > How 'bout this temporary fix, then?  This patch renders the other
 > patches I've posted on this thread obsolete. 

Just a little quibble.  Your ChangeLog entry refers to basic-block.h
but your patch doesn't.  

(BTW, I like this ghost coding; I take my dog for a stroll around the
port and when I return I find the patch that I was going to write
already posted.  Thanks.)

Michael.