[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler builtin

src/arm/code-stubs-arm.cc

Index: src/arm/code-stubs-arm.cc
diff --git a/src/arm/code-stubs-arm.cc b/src/arm/code-stubs-arm.cc
index f01dc10d5bce32f9eab27a7654a1e6b94c3b6cb8..9f082b366fa384aa038ab2470a2bd25bfc809685 100644
--- a/src/arm/code-stubs-arm.cc
+++ b/src/arm/code-stubs-arm.cc
@@ -2349,35 +2349,6 @@ void SubStringStub::Generate(MacroAssembler* masm) {
   generator.SkipSlow(masm, &runtime);
 }
 
-void ToStringStub::Generate(MacroAssembler* masm) {
-  // The ToString stub takes one argument in r0.
-  Label is_number;
-  __ JumpIfSmi(r0, &is_number);
-
-  __ CompareObjectType(r0, r1, r1, FIRST_NONSTRING_TYPE);
-  // r0: receiver
-  // r1: receiver instance type
-  __ Ret(lo);
-
-  Label not_heap_number;
-  __ cmp(r1, Operand(HEAP_NUMBER_TYPE));
-  __ b(ne, &not_heap_number);
-  __ bind(&is_number);
-  NumberToStringStub stub(isolate());
-  __ TailCallStub(&stub);
-  __ bind(&not_heap_number);
-
-  Label not_oddball;
-  __ cmp(r1, Operand(ODDBALL_TYPE));
-  __ b(ne, &not_oddball);
-  __ ldr(r0, FieldMemOperand(r0, Oddball::kToStringOffset));
-  __ Ret();
-  __ bind(&not_oddball);
-
-  __ push(r0);  // Push argument.
-  __ TailCallRuntime(Runtime::kToString);
-}
-
 
 void StringHelper::GenerateFlatOneByteStringEquals(
     MacroAssembler* masm, Register left, Register right, Register scratch1,