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[patch] Fix realignment code in the vectorizer

Following the correspondence here when creating realign_load
stmt in vectorizable_load (tree-vect-transform.c), use the type of the
return value of the mask_for_load builtin.

Bootstrapped and tested on ppc-linux.


:ADDPATCH SSA (vectorizer):

ChangeLog entry:

      * tree-vect-transform.c (vectorizable_load): Use the type of the
      return value of the mask_for_load builtin to create realign_load


Index: tree-vect-transform.c
--- tree-vect-transform.c       (revision 117455)
+++ tree-vect-transform.c       (working copy)
@@ -1916,10 +1916,12 @@ vectorizable_load (tree stmt, block_stmt
          /* Create permutation mask, if required, in loop preheader.  */
          tree builtin_decl;
          params = build_tree_list (NULL_TREE, init_addr);
-         vec_dest = vect_create_destination_var (scalar_dest, vectype);
          builtin_decl = targetm.vectorize.builtin_mask_for_load ();
          new_stmt = build_function_call_expr (builtin_decl, params);
-         new_stmt = build2 (MODIFY_EXPR, vectype, vec_dest, new_stmt);
+         vec_dest = vect_create_destination_var (scalar_dest,
+                                                 TREE_TYPE (new_stmt));
+         new_stmt = build2 (MODIFY_EXPR, TREE_TYPE (vec_dest), vec_dest,
+                            new_stmt);
          new_temp = make_ssa_name (vec_dest, new_stmt);
          TREE_OPERAND (new_stmt, 0) = new_temp;
          new_bb = bsi_insert_on_edge_immediate (pe, new_stmt);

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