[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/compiler/code-assembler.cc

Index: src/compiler/code-assembler.cc
diff --git a/src/compiler/code-assembler.cc b/src/compiler/code-assembler.cc
index 281186d729263124206c13a0b1c3c0632248958f..66357c267cb27d5170cf4943d7f9d95e2dc35962 100644
--- a/src/compiler/code-assembler.cc
+++ b/src/compiler/code-assembler.cc
@@ -299,6 +299,13 @@ Node* CodeAssembler::LoadRoot(Heap::RootListIndex root_index) {
               IntPtrConstant(root_index * kPointerSize));
 }
 
+Node* CodeAssembler::LoadFirstNativeContext() {
+  Node* native_contexts_list = ExternalConstant(
+      ExternalReference::native_contexts_list_address(isolate()));
+  return Load(MachineType::AnyTagged(), native_contexts_list,
+              IntPtrConstant(0));
+}
+
 Node* CodeAssembler::Store(MachineRepresentation rep, Node* base, Node* value) {
   return raw_assembler_->Store(rep, base, value, kFullWriteBarrier);
 }