--- old/src/share/vm/runtime/thread.cpp	2015-09-09 16:12:53.411861773 +0200
+++ new/src/share/vm/runtime/thread.cpp	2015-09-09 16:12:53.291861777 +0200
@@ -31,7 +31,6 @@
 #include "code/codeCacheExtensions.hpp"
 #include "code/scopeDesc.hpp"
 #include "compiler/compileBroker.hpp"
-#include "gc/shared/gcId.hpp"
 #include "gc/shared/gcLocker.inline.hpp"
 #include "gc/shared/workgroup.hpp"
 #include "interpreter/interpreter.hpp"
@@ -220,7 +219,6 @@
   NOT_PRODUCT(_skip_gcalot = false;)
   _jvmti_env_iteration_count = 0;
   set_allocated_bytes(0);
-  _gc_id = GCId::undefined();
   _vm_operation_started_count = 0;
   _vm_operation_completed_count = 0;
   _current_pending_monitor = NULL;