Revert of [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 d1ce6ed8f88c6c596f2cda4f00eb4aa88545064f..3c253d41dfa0a8e38433c6d83eee3c4c653b5de9 100644
--- a/src/compiler/js-builtin-reducer.h
+++ b/src/compiler/js-builtin-reducer.h
@@ -21,7 +21,6 @@
 class CommonOperatorBuilder;
 struct FieldAccess;
 class JSGraph;
-class JSOperatorBuilder;
 class SimplifiedOperatorBuilder;
 class TypeCache;
 
@@ -87,7 +86,6 @@
   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);
@@ -102,7 +100,6 @@
   Isolate* isolate() const;
   CommonOperatorBuilder* common() const;
   SimplifiedOperatorBuilder* simplified() const;
-  JSOperatorBuilder* javascript() const;
   CompilationDependencies* dependencies() const { return dependencies_; }
 
   CompilationDependencies* const dependencies_;