[regexp] Turn last match info into a simple FixedArray

src/regexp/regexp-utils.h

 // Copyright 2016 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_REGEXP_REGEXP_UTILS_H_
 #define V8_REGEXP_REGEXP_UTILS_H_
 
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 
 // Helper methods for C++ regexp builtins.
 class RegExpUtils : public AllStatic {
  public:
   // Last match info accessors.
-  static Handle<Object> GetLastMatchField(Isolate* isolate,
-                                          Handle<JSObject> match_info,
-                                          int index);
-  static void SetLastMatchField(Isolate* isolate, Handle<JSObject> match_info,
-                                int index, Handle<Object> value);
-  static int GetLastMatchNumberOfCaptures(Isolate* isolate,
-                                          Handle<JSObject> match_info);
-  static Handle<String> GetLastMatchSubject(Isolate* isolate,
-                                            Handle<JSObject> match_info);
-  static Handle<Object> GetLastMatchInput(Isolate* isolate,
-                                          Handle<JSObject> match_info);
-  static int GetLastMatchCapture(Isolate* isolate, Handle<JSObject> match_info,
-                                 int i);
   static Handle<String> GenericCaptureGetter(Isolate* isolate,
-                                             Handle<JSObject> match_info,
+                                             Handle<RegExpMatchInfo> match_info,
                                              int capture, bool* ok = nullptr);
 
   // Last index (RegExp.lastIndex) accessors.
   static MaybeHandle<Object> SetLastIndex(Isolate* isolate,
                                           Handle<JSReceiver> regexp, int value);
   static MaybeHandle<Object> GetLastIndex(Isolate* isolate,
                                           Handle<JSReceiver> recv);
 
   // ES#sec-regexpexec Runtime Semantics: RegExpExec ( R, S )
   static MaybeHandle<Object> RegExpExec(Isolate* isolate,
@@ skipping 14 matching lines @@
   static MaybeHandle<Object> SetAdvancedStringIndex(Isolate* isolate,
                                                     Handle<JSReceiver> regexp,
                                                     Handle<String> string,
                                                     bool unicode);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_REGEXP_REGEXP_UTILS_H_