(variable_size): When evaluating sizes of variable types, do so just

for side-effects (the SAVE_EXPRs).

From-SVN: r3895

gcc/stor-layout.c

@@ -90,8 +90,10 @@ variable_size (size)
     }
 
   if (immediate_size_expand)
-    /* NULL_RTX is not defined; neither is the rtx type.  */
-    expand_expr (size, NULL_PTR, VOIDmode, 0);
+    /* NULL_RTX is not defined; neither is the rtx type. 
+       Also, we would like to pass const0_rtx here, but don't have it.  */
+    expand_expr (size, expand_expr (integer_zero_node, NULL_PTR, VOIDmode, 0),
+		 VOIDmode, 0);
   else
     pending_sizes = tree_cons (NULL_TREE, size, pending_sizes);