src/share/vm/c1/c1_Compiler.cpp

rev 10065 : 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
Contributed-by: ikrylov, ygaevsky
Reviewed-by: iveresov, vlivanov, kvn

@@ -129,10 +129,13 @@
     if (UseCompressedOops && !VM_Version::supports_atomic_getset4()) return false;
 #else
     if (!VM_Version::supports_atomic_getset4()) return false;
 #endif
     break;
+  case vmIntrinsics::_onSpinWait:
+    if (!VM_Version::supports_on_spin_wait()) return false;
+    break;
   case vmIntrinsics::_arraycopy:
   case vmIntrinsics::_currentTimeMillis:
   case vmIntrinsics::_nanoTime:
   case vmIntrinsics::_Reference_get:
     // Use the intrinsic version of Reference.get() so that the value in