[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 8d8a53b6604913605593d634729cec96d12c8a93..305c5f3e33f7449726074a13e3fa97ab96a22b08 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)                              \
@@ -3160,14 +3159,6 @@ class SubStringStub : public PlatformCodeStub {
   DEFINE_PLATFORM_CODE_STUB(SubString, PlatformCodeStub);
 };
 
-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) {}