src/share/vm/opto/memnode.cpp

rev 10271 : 8147844: new method j.l.Runtime.onSpinWait() and the corresponding x86 hotspot instrinsic
Summary: adds c1 & c2 x86 intrinsics for j.l.Runtime.onSpinWait() that utilize the PAUSE instruction
Reviewed-by: iveresov, kvn, vlivanov
Contributed-by: Ivan Krylov <ivan@azul.com>, Yuri Gaevsky <ygaevsky@azul.com>

@@ -2898,10 +2898,11 @@
   case Op_StoreFence:        return new StoreFenceNode(C, atp, pn);
   case Op_MemBarAcquireLock: return new MemBarAcquireLockNode(C, atp, pn);
   case Op_MemBarReleaseLock: return new MemBarReleaseLockNode(C, atp, pn);
   case Op_MemBarVolatile:    return new MemBarVolatileNode(C, atp, pn);
   case Op_MemBarCPUOrder:    return new MemBarCPUOrderNode(C, atp, pn);
+  case Op_OnSpinWait:        return new OnSpinWaitNode(C, atp, pn);
   case Op_Initialize:        return new InitializeNode(C, atp, pn);
   case Op_MemBarStoreStore:  return new MemBarStoreStoreNode(C, atp, pn);
   default: ShouldNotReachHere(); return NULL;
   }
 }