[es6] Reintroduce the instanceof operator in the backends.

src/crankshaft/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 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/crankshaft/arm64/lithium-codegen-arm64.h"
 
 #include "src/arm64/frames-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2784 matching lines @@
   Register result = ToRegister(instr->result());
   Register base = ToRegister(instr->base_object());
   if (instr->offset()->IsConstantOperand()) {
     __ Add(result, base, ToOperand32(instr->offset()));
   } else {
     __ Add(result, base, Operand(ToRegister32(instr->offset()), SXTW));
   }
 }
 
 
-void LCodeGen::DoInstanceOf(LInstanceOf* instr) {
-  DCHECK(ToRegister(instr->context()).is(cp));
-  DCHECK(ToRegister(instr->left()).is(InstanceOfDescriptor::LeftRegister()));
-  DCHECK(ToRegister(instr->right()).is(InstanceOfDescriptor::RightRegister()));
-  DCHECK(ToRegister(instr->result()).is(x0));
-  InstanceOfStub stub(isolate());
-  CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
-}
-
-
 void LCodeGen::DoHasInPrototypeChainAndBranch(
     LHasInPrototypeChainAndBranch* instr) {
   Register const object = ToRegister(instr->object());
   Register const object_map = ToRegister(instr->scratch1());
   Register const object_instance_type = ToRegister(instr->scratch2());
   Register const object_prototype = object_map;
   Register const prototype = ToRegister(instr->prototype());
 
   // The {object} must be a spec object.  It's sufficient to know that {object}
   // is not a smi, since all other non-spec objects have {null} prototypes and
@@ skipping 2945 matching lines @@
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(deferred->exit());
   __ Bind(&done);
 }
 
 }  // namespace internal
 }  // namespace v8