Revert of [js] Avoid %_ClassOf for collection builtins.

src/runtime/runtime-collections.cc

Index: src/runtime/runtime-collections.cc
diff --git a/src/runtime/runtime-collections.cc b/src/runtime/runtime-collections.cc
index 0e311517e93c4e183446ba0aa19d07d48bdc5621..214ce1c4e6cf590b3d54fb237a8b51758c44a764 100644
--- a/src/runtime/runtime-collections.cc
+++ b/src/runtime/runtime-collections.cc
@@ -325,48 +325,5 @@
   CHECK(max_values >= 0);
   return *JSWeakCollection::GetEntries(holder, max_values);
 }
-
-RUNTIME_FUNCTION(Runtime_IsJSMap) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSMap());
-}
-
-RUNTIME_FUNCTION(Runtime_IsJSSet) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSSet());
-}
-
-RUNTIME_FUNCTION(Runtime_IsJSMapIterator) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSMapIterator());
-}
-
-RUNTIME_FUNCTION(Runtime_IsJSSetIterator) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSSetIterator());
-}
-
-RUNTIME_FUNCTION(Runtime_IsJSWeakMap) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSWeakMap());
-}
-
-RUNTIME_FUNCTION(Runtime_IsJSWeakSet) {
-  SealHandleScope shs(isolate);
-  DCHECK_EQ(1, args.length());
-  CONVERT_ARG_CHECKED(Object, obj, 0);
-  return isolate->heap()->ToBoolean(obj->IsJSWeakSet());
-}
-
 }  // namespace internal
 }  // namespace v8