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

src/globals.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1223 matching lines @@
   // The top JS frame had been calling debug break slot stub. Patch the
   // address this stub jumps to in the end.
   LIVE_EDIT_FRAME_DROPPED_IN_DEBUG_SLOT_CALL,
   // The top JS frame had been calling some C++ function. The return address
   // gets patched automatically.
   LIVE_EDIT_FRAME_DROPPED_IN_DIRECT_CALL,
   LIVE_EDIT_FRAME_DROPPED_IN_RETURN_CALL,
   LIVE_EDIT_CURRENTLY_SET_MODE
 };
 
-enum class UnicodeEncoding : uint8_t {
-  // Different unicode encodings in a |word32|:
-  UTF16,  // hi 16bits -> trailing surrogate or 0, low 16bits -> lead surrogate
-  UTF32,  // full UTF32 code unit / Unicode codepoint
-};
-
-inline size_t hash_value(UnicodeEncoding encoding) {
-  return static_cast<uint8_t>(encoding);
-}
-
-inline std::ostream& operator<<(std::ostream& os, UnicodeEncoding encoding) {
-  switch (encoding) {
-    case UnicodeEncoding::UTF16:
-      return os << "UTF16";
-    case UnicodeEncoding::UTF32:
-      return os << "UTF32";
-  }
-  UNREACHABLE();
-  return os;
-}
-
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_