[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/code-stub-assembler.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUB_ASSEMBLER_H_
 #define V8_CODE_STUB_ASSEMBLER_H_
 
 #include <functional>
 
 #include "src/compiler/code-assembler.h"
 #include "src/globals.h"
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 class CallInterfaceDescriptor;
 class StatsCounter;
 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)                \
   V(EmptyFixedArray, EmptyFixedArray)         \
   V(FalseValue, False)                        \
   V(FixedArrayMap, FixedArrayMap)             \
   V(FixedCOWArrayMap, FixedCOWArrayMap)       \
   V(FixedDoubleArrayMap, FixedDoubleArrayMap) \
   V(HeapNumberMap, HeapNumberMap)             \
   V(MinusZeroValue, MinusZero)                \
@@ skipping 1235 matching lines @@
   }
 #else
 #define CSA_SLOW_ASSERT(x)
 #endif
 
 DEFINE_OPERATORS_FOR_FLAGS(CodeStubAssembler::AllocationFlags);
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_CODE_STUB_ASSEMBLER_H_