Loop unroll fixes

[David Edelsohn]

	The maintainer of the part of the compiler affected by the patch
has not responded to repeated requests for his feedback.  One other
developer has asked for the approval of the patch to be delayed until he
reviewed it, but has not done so.

	If there is no specific, documented, technical objection to this
patch within one week, it will be approved.  Any problems will be handled
by the GCC policy for patches which have been committed.  If anyone has
concerns about this patch, review it now.

Thanks, David