initialize_uninitialized_subregs causing bootstrap failure

[David Edelsohn]

>>>>> Andrew Macleod writes:

Andrew> urg. See if this helps, if so, I'll check it in.... It looks like I checked in the 
Andrew> n-1 version of the patch somehow...  (which also bootstrapped on 2 targets...)

	Yes, it looks like that patch fixes the failure.

Thanks!
David