8232651: Add implementation of os::processor_id() for Windows

Reviewed-by: dholmes, stuefe

src/hotspot/os/windows/os_windows.cpp

@@ -795,6 +795,10 @@ int os::active_processor_count() {
   }
 }
 
+uint os::processor_id() {
+  return (uint)GetCurrentProcessorNumber();
+}
+
 void os::set_native_thread_name(const char *name) {
 
   // See: http://msdn.microsoft.com/en-us/library/xcb2z8hs.aspx