[PATCH GCC][obvious]Don't reset ssa_name infor in struct iv.

[Bin Cheng]

Hi,
I applied a patch before to keep ssa_name information in struct iv.  Seems
this function somehow slipped away.
Will apply it to trunk.

Thanks,
bin

2015-06-26  Bin Cheng  <bin.ch...@arm.com>

        * tree-ssa-loop-ivopts.c (record_sub_use): Don't reset ssa_name
        field in struct iv.

Index: gcc/tree-ssa-loop-ivopts.c
===================================================================
--- gcc/tree-ssa-loop-ivopts.c  (revision 224930)
+++ gcc/tree-ssa-loop-ivopts.c  (working copy)
@@ -1390,10 +1396,6 @@ record_sub_use (struct ivopts_data *data, tree *us
       pre->next = use;
     }
 
-  /* To avoid showing ssa name in the dumps, if it was not reset by the
-     caller.  */
-  iv->ssa_name = NULL_TREE;
-
   return use;
 }