--- a/hotspot/src/share/vm/asm/codeBuffer.hpp	Fri Oct 16 02:05:54 2015 +0300
+++ b/hotspot/src/share/vm/asm/codeBuffer.hpp	Tue Oct 13 16:25:50 2015 +0000
@@ -375,6 +375,8 @@
   OopRecorder  _default_oop_recorder;  // override with initialize_oop_recorder
   Arena*       _overflow_arena;
 
+  address      _last_membar;     // used to merge consecutive memory barriers
+
   address      _decode_begin;   // start address for decode
   address      decode_begin();
 
@@ -388,6 +390,7 @@
     _decode_begin    = NULL;
     _overflow_arena  = NULL;
     _code_strings    = CodeStrings();
+    _last_membar     = NULL;
   }
 
   void initialize(address code_start, csize_t code_size) {
@@ -577,6 +580,10 @@
   OopRecorder* oop_recorder() const   { return _oop_recorder; }
   CodeStrings& strings()              { return _code_strings; }
 
+  address last_membar() const { return _last_membar; }
+  void set_last_membar(address a) { _last_membar = a; }
+  void clear_last_membar() { set_last_membar(NULL); }
+
   void free_strings() {
     if (!_code_strings.is_null()) {
       _code_strings.free(); // sets _strings Null as a side-effect.