RFA: patch solving PR/37377

[Jeff Law]

Eric Botcazou wrote:
>   
>> 2008-09-08  Vladimir Makarov  <vmakarov@redhat.com>
>>
>>     PR rtl-opt/37377
>>
>>     * ira-build.c (common_loop_tree_node_dominator): Remove.
>>     (copy_live_ranges_to_removed_store_destinations): New function.
>>     (regno_top_level_allocno_map): Move to top level from ...
>>     (ira_flattening): ... here.  Use
>>     copy_live_ranges_to_removed_store_destinations.
>>
>>     * ira-emit.c (generate_edge_moves): Fix a comment.
>>     
>
> Given that I debugged the problem and that it's formally an RTL optimization, 
> I think I can approve the patch, so OK for mainline.
>
>   
And if there's any doubt, I've reviewed the patch and approve it as well.

jeff