[stubs] Migrate ToLengthStub to TurboFan.

src/mips64/code-stubs-mips64.cc

 // Copyright 2012 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_MIPS64
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 2817 matching lines @@
   __ And(at, a2, Operand(String::kContainsCachedArrayIndexMask));
   __ Branch(&runtime, ne, at, Operand(zero_reg));
   __ IndexFromHash(a2, v0);
   __ Ret();
 
   __ bind(&runtime);
   __ Push(a0);  // Push argument.
   __ TailCallRuntime(Runtime::kStringToNumber);
 }
 
-void ToLengthStub::Generate(MacroAssembler* masm) {
-  // The ToLength stub takes on argument in a0.
-  Label not_smi, positive_smi;
-  __ JumpIfNotSmi(a0, &not_smi);
-  STATIC_ASSERT(kSmiTag == 0);
-  __ Branch(&positive_smi, ge, a0, Operand(zero_reg));
-  __ mov(a0, zero_reg);
-  __ bind(&positive_smi);
-  __ Ret(USE_DELAY_SLOT);
-  __ mov(v0, a0);
-  __ bind(&not_smi);
-
-  __ push(a0);  // Push argument.
-  __ TailCallRuntime(Runtime::kToLength);
-}
-
-
 void ToStringStub::Generate(MacroAssembler* masm) {
   // The ToString stub takes on argument in a0.
   Label is_number;
   __ JumpIfSmi(a0, &is_number);
 
   Label not_string;
   __ GetObjectType(a0, a1, a1);
   // a0: receiver
   // a1: receiver instance type
   __ Branch(&not_string, ge, a1, Operand(FIRST_NONSTRING_TYPE));
@@ skipping 2907 matching lines @@
                            return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS64