remove unnecessary calls to vec::release

There's no point in calling release () on an auto_vec just before it goes
out of scope.

gcc/ChangeLog:

2016-07-12  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>

	* tree-data-ref.c (find_data_references_in_stmt): Remove
	unnecessary call to vec::release.
	(graphite_find_data_references_in_stmt): Likewise.
	* tree-ssa-alias.c (nonoverlapping_component_refs_of_decl_p): Likewise.
	* tree-vect-stmts.c (vectorizable_condition): Likewise.

From-SVN: r238286

gcc/ChangeLog

 2016-07-12  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 
+	* tree-data-ref.c (find_data_references_in_stmt): Remove
+	unnecessary call to vec::release.
+	(graphite_find_data_references_in_stmt): Likewise.
+	* tree-ssa-alias.c (nonoverlapping_component_refs_of_decl_p): Likewise.
+	* tree-vect-stmts.c (vectorizable_condition): Likewise.
+
+2016-07-12  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
+
 	* cfgexpand.c (expand_used_vars): Make the type of a local variable auto_vec.
 	* genmatch.c (lower_for): Likewise.
 	* haifa-sched.c (haifa_sched_init): Likewise.

gcc/tree-data-ref.c

@@ -3999,7 +3999,7 @@ find_data_references_in_stmt (struct loop *nest, gimple *stmt,
       gcc_assert (dr != NULL);
       datarefs->safe_push (dr);
     }
-  references.release ();
+
   return ret;
 }
 
@@ -4029,7 +4029,6 @@ graphite_find_data_references_in_stmt (loop_p nest, loop_p loop, gimple *stmt,
       datarefs->safe_push (dr);
     }
 
-  references.release ();
   return ret;
 }
 

gcc/tree-ssa-alias.c

@@ -865,7 +865,7 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
   if (TREE_CODE (ref1) == MEM_REF)
     {
       if (!integer_zerop (TREE_OPERAND (ref1, 1)))
-	goto may_overlap;
+	return false;
       ref1 = TREE_OPERAND (TREE_OPERAND (ref1, 0), 0);
     }
 
@@ -878,7 +878,7 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
   if (TREE_CODE (ref2) == MEM_REF)
     {
       if (!integer_zerop (TREE_OPERAND (ref2, 1)))
-	goto may_overlap;
+	return false;
       ref2 = TREE_OPERAND (TREE_OPERAND (ref2, 0), 0);
     }
 
@@ -898,7 +898,7 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
       do
 	{
 	  if (component_refs1.is_empty ())
-	    goto may_overlap;
+	    return false;
 	  ref1 = component_refs1.pop ();
 	}
       while (!RECORD_OR_UNION_TYPE_P (TREE_TYPE (TREE_OPERAND (ref1, 0))));
@@ -906,7 +906,7 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
       do
 	{
 	  if (component_refs2.is_empty ())
-	     goto may_overlap;
+	     return false;
 	  ref2 = component_refs2.pop ();
 	}
       while (!RECORD_OR_UNION_TYPE_P (TREE_TYPE (TREE_OPERAND (ref2, 0))));
@@ -914,7 +914,7 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
       /* Beware of BIT_FIELD_REF.  */
       if (TREE_CODE (ref1) != COMPONENT_REF
 	  || TREE_CODE (ref2) != COMPONENT_REF)
-	goto may_overlap;
+	return false;
 
       tree field1 = TREE_OPERAND (ref1, 1);
       tree field2 = TREE_OPERAND (ref2, 1);
@@ -927,12 +927,10 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
 
       /* We cannot disambiguate fields in a union or qualified union.  */
       if (type1 != type2 || TREE_CODE (type1) != RECORD_TYPE)
-	 goto may_overlap;
+	 return false;
 
       if (field1 != field2)
 	{
-	  component_refs1.release ();
-	  component_refs2.release ();
 	  /* A field and its representative need to be considered the
 	     same.  */
 	  if (DECL_BIT_FIELD_REPRESENTATIVE (field1) == field2
@@ -946,9 +944,6 @@ nonoverlapping_component_refs_of_decl_p (tree ref1, tree ref2)
 	}
     }
 
-may_overlap:
-  component_refs1.release ();
-  component_refs2.release ();
   return false;
 }
 

gcc/tree-vect-stmts.c

@@ -7686,9 +7686,6 @@ vectorizable_condition (gimple *stmt, gimple_stmt_iterator *gsi,
 	      if (!masked)
 		vec_oprnds1 = vec_defs.pop ();
 	      vec_oprnds0 = vec_defs.pop ();
-
-              ops.release ();
-              vec_defs.release ();
             }
           else
             {