remove NMethodEntryBarrier_lock

Author: dean-long

src/hotspot/share/runtime/mutexLocker.cpp

@@ -36,7 +36,6 @@
 // Mutexes used in the VM (see comment in mutexLocker.hpp):
 
 Mutex*   NMethodState_lock            = nullptr;
-Mutex*   NMethodEntryBarrier_lock     = nullptr;
 Monitor* SystemDictionary_lock        = nullptr;
 Mutex*   InvokeMethodTypeTable_lock   = nullptr;
 Monitor* InvokeMethodIntrinsicTable_lock = nullptr;
@@ -206,8 +205,6 @@ void assert_lock_strong(const Mutex* lock) {
 void mutex_init() {
   MUTEX_DEFN(tty_lock                        , PaddedMutex  , tty);      // allow to lock in VM
 
-  MUTEX_DEFN(NMethodEntryBarrier_lock        , PaddedMutex  , service-1);
-
   MUTEX_DEFN(STS_lock                        , PaddedMonitor, nosafepoint);
 
   if (UseG1GC) {

src/hotspot/share/runtime/mutexLocker.hpp

@@ -34,7 +34,6 @@ class Thread;
 // Mutexes used in the VM.
 
 extern Mutex*   NMethodState_lock;               // a lock used to guard a compiled method state
-extern Mutex*   NMethodEntryBarrier_lock;        // protects nmethod entry barrier
 extern Monitor* SystemDictionary_lock;           // a lock on the system dictionary
 extern Mutex*   InvokeMethodTypeTable_lock;
 extern Monitor* InvokeMethodIntrinsicTable_lock;