[Interpreter] Add ClassOf intrinsic.

src/interpreter/interpreter-intrinsics.h

Index: src/interpreter/interpreter-intrinsics.h
diff --git a/src/interpreter/interpreter-intrinsics.h b/src/interpreter/interpreter-intrinsics.h
index 6fcb925a84a908a06ef3e259e6418eea9f771c3c..e6a085dcb308d0963f679d37cb7f26c21d2c2312 100644
--- a/src/interpreter/interpreter-intrinsics.h
+++ b/src/interpreter/interpreter-intrinsics.h
@@ -26,6 +26,7 @@ namespace interpreter {
 // expected number of arguments (-1 denoting argument count is variable).
 #define INTRINSICS_LIST(V)                              \
   V(Call, call, -1)                                     \
+  V(ClassOf, class_of, 1)                               \
   V(HasProperty, has_property, 2)                       \
   V(IsArray, is_array, 1)                               \
   V(IsJSProxy, is_js_proxy, 1)                          \