[PATCH] Fix ICE in vectorizable_live_operation

[Jeff Law]

On 10/15/20 3:49 AM, Richard Biener wrote:
> This fixes the case where the insertion iterator for the live stmt
> is the end of a BB by adjusting the dominance query to the definition
> of the def we're substituting.
>
> Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
>
> 2020-10-15  Richard Biener  <rguenther@suse.de>
>
> 	* tree-vect-loop.c (vectorizable_live_operation): Adjust
> 	dominance query.
>
> 	* gcc.dg/vect/bb-slp-52.c: New testcase.

Assuming this is a fix for the issue I sent privately last night. 
Thanks a ton!


Jeff