[turbofan] inline %StringIteratorPrototype%.next in JSBuiltinReducer.

src/compiler/js-builtin-reducer.h

Index: src/compiler/js-builtin-reducer.h
diff --git a/src/compiler/js-builtin-reducer.h b/src/compiler/js-builtin-reducer.h
index 3c253d41dfa0a8e38433c6d83eee3c4c653b5de9..d1ce6ed8f88c6c596f2cda4f00eb4aa88545064f 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -21,6 +21,7 @@ namespace compiler {
 class CommonOperatorBuilder;
 struct FieldAccess;
 class JSGraph;
+class JSOperatorBuilder;
 class SimplifiedOperatorBuilder;
 class TypeCache;
 
@@ -86,6 +87,7 @@ class JSBuiltinReducer final : public AdvancedReducer {
   Reduction ReduceStringCharAt(Node* node);
   Reduction ReduceStringCharCodeAt(Node* node);
   Reduction ReduceStringFromCharCode(Node* node);
+  Reduction ReduceStringIteratorNext(Node* node);
   Reduction ReduceArrayBufferViewAccessor(Node* node,
                                           InstanceType instance_type,
                                           FieldAccess const& access);
@@ -100,6 +102,7 @@ class JSBuiltinReducer final : public AdvancedReducer {
   Isolate* isolate() const;
   CommonOperatorBuilder* common() const;
   SimplifiedOperatorBuilder* simplified() const;
+  JSOperatorBuilder* javascript() const;
   CompilationDependencies* dependencies() const { return dependencies_; }
 
   CompilationDependencies* const dependencies_;