[patch] fix ice on comparison of aggregates with bitfield

[Olivier Hainque]

Roger Sayle wrote:
> This is OK for mainline. 

> The for_each_index change looks correct, but I'm sure that the
> tree-ssa loop folks will let me know if it isn't, or causes problems
> elsewhere.
 
 OK, just installed as rev 114963.

> Thanks again for making these changes.

 You are very welcome. Thanks much for your review and constructive feedback.

 Olivier