[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index 1ed5615c4205604bb05b801db870e6d60c4514cf..7eb75ed58ee41c0c5722992725150fe6030732c7 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -20,8 +20,6 @@ class StubCache;
 
 enum class PrimitiveType { kBoolean, kNumber, kString, kSymbol };
 
-enum class IterationKind { kKeys, kValues, kEntries };
-
 #define HEAP_CONSTANT_LIST(V)                 \
   V(BooleanMap, BooleanMap)                   \
   V(empty_string, EmptyString)                \
@@ -633,6 +631,10 @@ class V8_EXPORT_PRIVATE CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* IsDictionary(compiler::Node* object);
   compiler::Node* IsUnseededNumberDictionary(compiler::Node* object);
 
+  // ElementsKind helpers:
+  compiler::Node* IsFastElementsKind(compiler::Node* elements_kind);
+  compiler::Node* IsHoleyFastElementsKind(compiler::Node* elements_kind);
+
   // String helpers.
   // Load a character from a String (might flatten a ConsString).
   compiler::Node* StringCharCodeAt(compiler::Node* string,