diff -r aa3d708d67c4 -r 0382d2b469b2 src/share/vm/memory/gcLocker.hpp
--- a/src/share/vm/memory/gcLocker.hpp	Wed Feb 01 07:59:01 2012 -0800
+++ b/src/share/vm/memory/gcLocker.hpp	Wed Feb 01 16:57:08 2012 -0800
@@ -164,6 +164,8 @@
   // is set, the slow path is always taken, till _needs_gc is cleared.
   static void lock_critical(JavaThread* thread);
   static void unlock_critical(JavaThread* thread);
+
+  static address needs_gc_address() { return (address) &_needs_gc; }
 };