[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/isolate-inl.h

Index: src/isolate-inl.h
diff --git a/src/isolate-inl.h b/src/isolate-inl.h
index 34c98bba645a5a44253689b954abc9370b550209..787f235916f30c1e3a175c50dd499031c2d83dfe 100644
--- a/src/isolate-inl.h
+++ b/src/isolate-inl.h
@@ -143,6 +143,11 @@ bool Isolate::IsStringLengthOverflowIntact() {
   return has_instance_cell->value() == Smi::FromInt(kArrayProtectorValid);
 }
 
+bool Isolate::CanInlineArrayIterator() {

[Camillo Bruni, 2016/11/09 12:03:49]

nit: Could you rename this function to be more consistent with the rest?
IsArrayIteratorLookupChainIntact() maybe?

[caitp, 2016/11/09 17:40:16]

I'm not sure what a good name for this is, but "LookupChainIntact" seems to be
unrelated to what it's actually tracking. "IsArrayIteratedObjectMapIntact"
maybe?

+  Cell* array_iterator_cell = heap()->array_iterator_protector();
+  return array_iterator_cell->value() == Smi::FromInt(kArrayProtectorValid);
+}
+
 }  // namespace internal
 }  // namespace v8