[stubs] Migrate ToLengthStub to TurboFan.

src/arm64/code-stubs-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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 3281 matching lines @@
   __ Tst(x2, Operand(String::kContainsCachedArrayIndexMask));
   __ B(ne, &runtime);
   __ IndexFromHash(x2, x0);
   __ Ret();
 
   __ Bind(&runtime);
   __ Push(x0);  // Push argument.
   __ TailCallRuntime(Runtime::kStringToNumber);
 }
 
-void ToLengthStub::Generate(MacroAssembler* masm) {
-  // The ToLength stub takes one argument in x0.
-  Label not_smi;
-  __ JumpIfNotSmi(x0, &not_smi);
-  STATIC_ASSERT(kSmiTag == 0);
-  __ Tst(x0, x0);
-  __ Csel(x0, x0, Operand(0), ge);
-  __ Ret();
-  __ Bind(&not_smi);
-
-  __ Push(x0);  // Push argument.
-  __ TailCallRuntime(Runtime::kToLength);
-}
-
-
 void ToStringStub::Generate(MacroAssembler* masm) {
   // The ToString stub takes one argument in x0.
   Label is_number;
   __ JumpIfSmi(x0, &is_number);
 
   Label not_string;
   __ JumpIfObjectType(x0, x1, x1, FIRST_NONSTRING_TYPE, &not_string, hs);
   // x0: receiver
   // x1: receiver instance type
   __ Ret();
@@ skipping 2627 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64