A latent bug - use of BRANCH_EDGE on trees.

[Devang Patel]

>> I was just scratching my head for the same reason.  If I change
>> BRANCH_EDGE, I would have to change FALLTHRU_EDGE to be complete.  But
>> then tree dump would look confusing; when the true arm appears to
>> falls through in tree dump, we don't have EDGE_FALLTHRU_FLAG.
>>
>> Let's go with Zdenek's first suggestion.
>>
>>   Let the caller pass the edge corresponding to the current
>>   BRANCH_EDGE (switch_bb) to loopify
>>
>> By the way, tree_ssa_loop_version uses FALLTHRU_EDGE, so I guess I
>> have to fix that.

	[ I was on vacation. ]

Yes. It uses FALLTRHU_EDGE to update pending statements.

-
Devang