[builtins] implement Array.prototype[@@iterator] in TFJ builtins

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 8ec67ee82611f8a8907628cc5a59595ec5b2b3ab..cc89b14eaf8d9a2ae46fedbc4946692d62294cee 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -19,6 +19,8 @@ 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)                \
@@ -139,6 +141,9 @@ class CodeStubAssembler : public compiler::CodeAssembler {
         WordOr(BitcastTaggedToWord(a), BitcastTaggedToWord(b)));
   }
 
+  // Smi | HeapNumber operations.
+  compiler::Node* NumberInc(compiler::Node* value);
+
   // Allocate an object of the given size.
   compiler::Node* Allocate(compiler::Node* size, AllocationFlags flags = kNone);
   compiler::Node* Allocate(int size, AllocationFlags flags = kNone);
@@ -295,6 +300,10 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   compiler::Node* LoadDoubleWithHoleCheck(
       compiler::Node* base, compiler::Node* offset, Label* if_hole,
       MachineType machine_type = MachineType::Float64());
+  compiler::Node* LoadFixedTypedArrayElement(
+      compiler::Node* data_pointer, compiler::Node* index_node,
+      ElementsKind elements_kind,
+      ParameterMode parameter_mode = INTEGER_PARAMETERS);
 
   // Context manipulation
   compiler::Node* LoadContextElement(compiler::Node* context, int slot_index);
@@ -406,6 +415,17 @@ class CodeStubAssembler : public compiler::CodeAssembler {
                                      ParameterMode mode = INTEGER_PARAMETERS,
                                      AllocationFlags flags = kNone);
 
+  // Perform CreateArrayIterator (ES6 #sec-createarrayiterator).
+  compiler::Node* CreateArrayIterator(compiler::Node* array,
+                                      compiler::Node* array_map,
+                                      compiler::Node* array_type,
+                                      compiler::Node* context,
+                                      IterationKind mode);
+
+  compiler::Node* AllocateJSArrayIterator(compiler::Node* array,
+                                          compiler::Node* array_map,
+                                          compiler::Node* map);
+
   void FillFixedArrayWithValue(ElementsKind kind, compiler::Node* array,
                                compiler::Node* from_index,
                                compiler::Node* to_index,