[ignition] desugar GetIterator() via bytecode rather than via AST

src/interpreter/bytecode-generator.h

Index: src/interpreter/bytecode-generator.h
diff --git a/src/interpreter/bytecode-generator.h b/src/interpreter/bytecode-generator.h
index 584e34af79ea7e5d2d8a51fb45891c0094854117..41c529218fd5831c4222ba4b21db6ced580f86bf 100644
--- a/src/interpreter/bytecode-generator.h
+++ b/src/interpreter/bytecode-generator.h
@@ -194,6 +194,7 @@ class BytecodeGenerator final : public AstVisitor<BytecodeGenerator> {
   int feedback_index(FeedbackVectorSlot slot) const;
 
   Handle<Name> home_object_symbol() const { return home_object_symbol_; }
+  Handle<Name> iterator_symbol() const { return iterator_symbol_; }
   Handle<Name> prototype_string() const { return prototype_string_; }
   Handle<FixedArray> empty_fixed_array() const { return empty_fixed_array_; }
   const AstRawString* undefined_string() const { return undefined_string_; }
@@ -218,6 +219,7 @@ class BytecodeGenerator final : public AstVisitor<BytecodeGenerator> {
   int loop_depth_;
 
   Handle<Name> home_object_symbol_;
+  Handle<Name> iterator_symbol_;
   Handle<Name> prototype_string_;
   Handle<FixedArray> empty_fixed_array_;
   const AstRawString* undefined_string_;