diff -r d678e3277048 -r 6027dddc26c6 src/share/vm/opto/ifnode.cpp
--- a/src/share/vm/opto/ifnode.cpp	Mon Jun 28 10:52:50 2010 -0700
+++ b/src/share/vm/opto/ifnode.cpp	Mon Jun 28 14:54:39 2010 -0700
@@ -1081,11 +1081,9 @@
 
   igvn->register_new_node_with_optimizer(new_if_f);
   igvn->register_new_node_with_optimizer(new_if_t);
-  igvn->hash_delete(old_if_f);
-  igvn->hash_delete(old_if_t);
   // Flip test, so flip trailing control
-  igvn->subsume_node(old_if_f, new_if_t);
-  igvn->subsume_node(old_if_t, new_if_f);
+  igvn->replace_node(old_if_f, new_if_t);
+  igvn->replace_node(old_if_t, new_if_f);
 
   // Progress
   return iff;