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

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index a90439131011406432e261fe4ad10779483bfac9..8f1ecfc21ef7ce57cb7ce3677e6cd2de6956fe36 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -184,8 +184,6 @@
     WARN_UNUSED_RESULT;
 
 PretenureFlag PretenureFlagOf(const Operator* op) WARN_UNUSED_RESULT;
-
-UnicodeEncoding UnicodeEncodingOf(const Operator*) WARN_UNUSED_RESULT;
 
 // Interface for building simplified operators, which represent the
 // medium-level operations of V8, including adding numbers, allocating objects,
@@ -291,7 +289,6 @@
   const Operator* StringLessThanOrEqual();
   const Operator* StringCharCodeAt();
   const Operator* StringFromCharCode();
-  const Operator* StringFromCodePoint(UnicodeEncoding encoding);
 
   const Operator* PlainPrimitiveToNumber();
   const Operator* PlainPrimitiveToWord32();