[es6] Reintroduce the instanceof operator in the backends.

src/compiler/code-assembler.h

 // 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.
 
 #ifndef V8_COMPILER_CODE_ASSEMBLER_H_
 #define V8_COMPILER_CODE_ASSEMBLER_H_
 
 #include <map>
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
@@ skipping 218 matching lines @@
 
   // Store value to raw memory location.
   Node* Store(MachineRepresentation rep, Node* base, Node* value);
   Node* Store(MachineRepresentation rep, Node* base, Node* index, Node* value);
   Node* StoreNoWriteBarrier(MachineRepresentation rep, Node* base, Node* value);
   Node* StoreNoWriteBarrier(MachineRepresentation rep, Node* base, Node* index,
                             Node* value);
   Node* AtomicStore(MachineRepresentation rep, Node* base, Node* index,
                     Node* value);
 
+  // Store a value to the root array.
+  Node* StoreRoot(Heap::RootListIndex root_index, Node* value);
+
 // Basic arithmetic operations.
 #define DECLARE_CODE_ASSEMBLER_BINARY_OP(name) Node* name(Node* a, Node* b);
   CODE_ASSEMBLER_BINARY_OP_LIST(DECLARE_CODE_ASSEMBLER_BINARY_OP)
 #undef DECLARE_CODE_ASSEMBLER_BINARY_OP
 
   Node* WordShl(Node* value, int shift);
   Node* WordShr(Node* value, int shift);
 
 // Unary
 #define DECLARE_CODE_ASSEMBLER_UNARY_OP(name) Node* name(Node* a);
@@ skipping 142 matching lines @@
   // Map of variables to the list of value nodes that have been added from each
   // merge path in their order of merging.
   std::map<Variable::Impl*, std::vector<Node*>> variable_merges_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_ASSEMBLER_H_