Make jni_internal_test a CommonRuntimeTest.

Also clean up proxy_test and reflection_test.

Test: m test-art-host-gtest
Change-Id: I7530855a40d7b9f7214ea7a069508ae1361b2b42
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index d7f6127..ab90fc5 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -97,6 +97,9 @@
     return true;
   }
 
+  void MakeInterpreted(ObjPtr<mirror::Class> klass)
+      REQUIRES_SHARED(Locks::mutator_lock_);
+
   static bool StartDex2OatCommandLine(/*out*/std::vector<std::string>* argv,
                                       /*out*/std::string* error_msg);