[stubs] Migrate ToLengthStub to TurboFan.

src/mips64/code-stubs-mips64.cc

Index: src/mips64/code-stubs-mips64.cc
diff --git a/src/mips64/code-stubs-mips64.cc b/src/mips64/code-stubs-mips64.cc
index 0cadddfbdabc9db29b4e2d7be254cad285ac10f3..a30f5b5efa35715743935e41c122ef8d61e802b5 100644
--- a/src/mips64/code-stubs-mips64.cc
+++ b/src/mips64/code-stubs-mips64.cc
@@ -2835,23 +2835,6 @@ void StringToNumberStub::Generate(MacroAssembler* masm) {
   __ 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;