[Interpreter] Add ClassOf intrinsic.

src/code-stub-assembler.h

 // Copyright 2016 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.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
@@ skipping 135 matching lines @@
   // Load the instance type of a map.
   compiler::Node* LoadMapInstanceType(compiler::Node* map);
   // Load the instance descriptors of a map.
   compiler::Node* LoadMapDescriptors(compiler::Node* map);
   // Load the prototype of a map.
   compiler::Node* LoadMapPrototype(compiler::Node* map);
   // Load the instance size of a Map.
   compiler::Node* LoadMapInstanceSize(compiler::Node* map);
   // Load the inobject properties count of a Map (valid only for JSObjects).
   compiler::Node* LoadMapInobjectProperties(compiler::Node* map);
+  // Load the constructor of a Map (equivalent to Map::GetConstructor()).
+  compiler::Node* LoadMapConstructor(compiler::Node* map);
 
   // Load the hash field of a name.
   compiler::Node* LoadNameHashField(compiler::Node* name);
   // Load the hash value of a name. If {if_hash_not_computed} label
   // is specified then it also checks if hash is actually computed.
   compiler::Node* LoadNameHash(compiler::Node* name,
                                Label* if_hash_not_computed = nullptr);
 
   // Load length field of a String object.
   compiler::Node* LoadStringLength(compiler::Node* object);
@@ skipping 296 matching lines @@
                                        AllocationFlags flags,
                                        compiler::Node* top_adddress,
                                        compiler::Node* limit_address);
 
   static const int kElementLoopUnrollThreshold = 8;
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_