[stubs] Migrate ToLengthStub to TurboFan.

src/s390/code-stubs-s390.cc

 // Copyright 2014 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_S390
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2732 matching lines @@
   __ And(r0, r4, Operand(String::kContainsCachedArrayIndexMask));
   __ bne(&runtime);
   __ IndexFromHash(r4, r2);
   __ Ret();
 
   __ bind(&runtime);
   __ push(r2);  // Push argument.
   __ TailCallRuntime(Runtime::kStringToNumber);
 }
 
-void ToLengthStub::Generate(MacroAssembler* masm) {
-  // The ToLength stub takes one argument in r2.
-  Label not_smi;
-  __ JumpIfNotSmi(r2, &not_smi);
-  STATIC_ASSERT(kSmiTag == 0);
-  __ CmpP(r2, Operand::Zero());
-  Label positive;
-  __ bgt(&positive);
-  __ LoadImmP(r2, Operand::Zero());
-  __ bind(&positive);
-  __ Ret();
-  __ bind(&not_smi);
-
-  __ push(r2);  // Push argument.
-  __ TailCallRuntime(Runtime::kToLength);
-}
-
 void ToStringStub::Generate(MacroAssembler* masm) {
   // The ToString stub takes one argument in r2.
   Label done;
   Label is_number;
   __ JumpIfSmi(r2, &is_number);
 
   __ CompareObjectType(r2, r3, r3, FIRST_NONSTRING_TYPE);
   // r2: receiver
   // r3: receiver instance type
   __ blt(&done);
@@ skipping 2934 matching lines @@
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
                            kStackUnwindSpace, NULL, return_value_operand, NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390