--- old/src/share/vm/opto/block.cpp	2015-09-15 15:43:35.046997301 +0200
+++ new/src/share/vm/opto/block.cpp	2015-09-15 15:43:34.894997293 +0200
@@ -393,7 +393,7 @@
   VectorSet visited(a);
 
   // Allocate stack with enough space to avoid frequent realloc
-  Node_Stack nstack(a, C->unique() >> 1);
+  Node_Stack nstack(a, C->live_nodes() >> 1);
   nstack.push(_root, 0);
   uint sum = 0;                 // Counter for blocks