tree-inline decl_map: skip mapping NULL to itself

Mapping a NULL key is no use, skip it.

for  gcc/ChangeLog

	* tree-inline.cc (insert_decl_map): Skip mapping a NULL decl
	as value to itself.

diff --git a/gcc/tree-inline.cc b/gcc/tree-inline.cc
index c6c86af..bfea1cc 100644 (file)
--- a/gcc/tree-inline.cc
+++ b/gcc/tree-inline.cc
@@ -148,7 +148,7 @@ insert_decl_map (copy_body_data *id, tree key, tree value)
 
   /* Always insert an identity map as well.  If we see this same new
      node again, we won't want to duplicate it a second time.  */
-  if (key != value)
+  if (key != value && value)
     id->decl_map->put (value, value);
 }