go-backend.c (go_imported_unsafe): Update optimization_default_node.

	* go-backend.c (go_imported_unsafe): Update
	optimization_default_node.

From-SVN: r268921

gcc/go/ChangeLog

+2019-02-14  Ian Lance Taylor  <iant@golang.org>
+
+	* go-backend.c (go_imported_unsafe): Update
+	optimization_default_node.
+
 2019-02-13  Ian Lance Taylor  <iant@golang.org>
 
 	* go-gcc.cc: #include "opts.h".

gcc/go/go-backend.c

@@ -89,6 +89,7 @@ void
 go_imported_unsafe (void)
 {
   flag_strict_aliasing = false;
+  TREE_OPTIMIZATION (optimization_default_node)->x_flag_strict_aliasing = false;
 
   /* Let the backend know that the options have changed.  */
   targetm.override_options_after_change ();