[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler builtin

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 7b9d76bfdb74760e3b79a844cbe70cabdc38c767..453a54ca6567e0068cac28facdc052f701cb6e90 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -43,7 +43,6 @@ class ObjectLiteral;
   V(StoreBufferOverflow)                      \
   V(StoreElement)                             \
   V(SubString)                                \
-  V(ToString)                                 \
   V(StoreIC)                                  \
   V(KeyedStoreIC)                             \
   V(KeyedLoadIC)                              \
@@ -3114,14 +3113,6 @@ class SubStringStub : public TurboFanCodeStub {
   DEFINE_CODE_STUB(SubString, TurboFanCodeStub);
 };
 
-class ToStringStub final : public PlatformCodeStub {
- public:
-  explicit ToStringStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
-
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(TypeConversion);
-  DEFINE_PLATFORM_CODE_STUB(ToString, PlatformCodeStub);
-};
-
 class ToObjectStub final : public TurboFanCodeStub {
  public:
   explicit ToObjectStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}