diff -r d678e3277048 -r 6027dddc26c6 src/share/vm/opto/split_if.cpp
--- a/src/share/vm/opto/split_if.cpp	Mon Jun 28 10:52:50 2010 -0700
+++ b/src/share/vm/opto/split_if.cpp	Mon Jun 28 14:54:39 2010 -0700
@@ -217,8 +217,7 @@
   register_new_node(phi, blk1);
 
   // Remove cloned-up value from optimizer; use phi instead
-  _igvn.hash_delete(n);
-  _igvn.subsume_node( n, phi );
+  _igvn.replace_node( n, phi );
 
   // (There used to be a self-recursive call to split_up() here,
   // but it is not needed.  All necessary forward walking is done
@@ -352,8 +351,7 @@
   }
 
   if (use_blk == NULL) {        // He's dead, Jim
-    _igvn.hash_delete(use);
-    _igvn.subsume_node(use, C->top());
+    _igvn.replace_node(use, C->top());
   }
 
   return use_blk;