Fix fallout of -fsanitize=vptr.

2017-11-15  Martin Liska  <mliska@suse.cz>

	* decl.c (begin_destructor_body): Use cp_build_fold_indirect_ref
	instead of cp_build_indirect_ref.

From-SVN: r254765

gcc/cp/ChangeLog

 2017-11-15  Martin Liska  <mliska@suse.cz>
 
+	* decl.c (begin_destructor_body): Use cp_build_fold_indirect_ref
+	instead of cp_build_indirect_ref.
+
+2017-11-15  Martin Liska  <mliska@suse.cz>
+
 	* decl.c (begin_destructor_body): In case of VPTR sanitization
 	(with disabled recovery), zero vptr in order to catch virtual calls
 	after lifetime of an object.

gcc/cp/decl.c

@@ -15253,8 +15253,7 @@ begin_destructor_body (void)
 	  {
 	    tree binfo = TYPE_BINFO (current_class_type);
 	    tree ref
-	      = cp_build_indirect_ref (current_class_ptr, RO_NULL,
-				       tf_warning_or_error);
+	      = cp_build_fold_indirect_ref (current_class_ptr);
 
 	    tree vtbl_ptr = build_vfield_ref (ref, TREE_TYPE (binfo));
 	    tree vtbl = build_zero_cst (TREE_TYPE (vtbl_ptr));