[stubs] Add String and JSReceiver instance type predicates

src/interpreter/interpreter.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/interpreter/interpreter.h"
 
 #include <fstream>
 #include <memory>
 
 #include "src/ast/prettyprinter.h"
@@ skipping 2353 matching lines @@
   Node* receiver = __ LoadRegister(object_reg);
   Node* context = __ GetContext();
   Node* const zero_smi = __ SmiConstant(Smi::FromInt(0));
 
   Label nothing_to_iterate(assembler, Label::kDeferred),
       use_enum_cache(assembler), use_runtime(assembler, Label::kDeferred);
 
   if (FLAG_debug_code) {
     Label already_receiver(assembler), abort(assembler);
     Node* instance_type = __ LoadInstanceType(receiver);
-    Node* first_receiver_type = __ Int32Constant(FIRST_JS_RECEIVER_TYPE);
-    __ BranchIfInt32GreaterThanOrEqual(instance_type, first_receiver_type,
-                                       &already_receiver, &abort);
+    __ Branch(__ IsJSReceiverInstanceType(instance_type), &already_receiver,
+              &abort);
     __ Bind(&abort);
     {
       __ Abort(kExpectedJSReceiver);
       // TODO(klaasb) remove this unreachable Goto once Abort ends the block
       __ Goto(&already_receiver);
     }
     __ Bind(&already_receiver);
   }
 
   __ CheckEnumCache(receiver, &use_enum_cache, &use_runtime);
@@ skipping 212 matching lines @@
   __ StoreObjectField(generator, JSGeneratorObject::kContinuationOffset,
       __ SmiTag(new_state));
   __ SetAccumulator(old_state);
 
   __ Dispatch();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8