jni: Add @CriticalNative optimization to speed up JNI transitions

Change-Id: I963059ac3a72dd8e6a867596c356d7062deb6da7
diff --git a/runtime/well_known_classes.h b/runtime/well_known_classes.h
index 25c9424..ce710ff 100644
--- a/runtime/well_known_classes.h
+++ b/runtime/well_known_classes.h
@@ -41,6 +41,7 @@
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   static jclass com_android_dex_Dex;
+  static jclass dalvik_annotation_optimization_CriticalNative;
   static jclass dalvik_annotation_optimization_FastNative;
   static jclass dalvik_system_DexFile;
   static jclass dalvik_system_DexPathList;