[regexp] Properly handle HeapNumbers in AdvanceStringIndex

src/builtins/builtins-regexp.h

 // Copyright 2017 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_BUILTINS_BUILTINS_REGEXP_H_
 #define V8_BUILTINS_BUILTINS_REGEXP_H_
 
 #include "src/code-stub-assembler.h"
 
 namespace v8 {
@@ skipping 55 matching lines @@
   void FlagGetter(JSRegExp::Flag flag, v8::Isolate::UseCounterFeature counter,
                   const char* method_name);
 
   Node* IsRegExp(Node* const context, Node* const maybe_receiver);
   Node* RegExpInitialize(Node* const context, Node* const regexp,
                          Node* const maybe_pattern, Node* const maybe_flags);
 
   Node* RegExpExec(Node* context, Node* regexp, Node* string);
 
   Node* AdvanceStringIndex(Node* const string, Node* const index,
-                           Node* const is_unicode);
+                           Node* const is_unicode, bool is_fastpath);
 
   void RegExpPrototypeMatchBody(Node* const context, Node* const regexp,
                                 Node* const string, const bool is_fastpath);
 
   void RegExpPrototypeSearchBodyFast(Node* const context, Node* const regexp,
                                      Node* const string);
   void RegExpPrototypeSearchBodySlow(Node* const context, Node* const regexp,
                                      Node* const string);
 
   void RegExpPrototypeSplitBody(Node* const context, Node* const regexp,
                                 Node* const string, Node* const limit);
 
   Node* ReplaceGlobalCallableFastPath(Node* context, Node* regexp, Node* string,
                                       Node* replace_callable);
   Node* ReplaceSimpleStringFastPath(Node* context, Node* regexp, Node* string,
                                     Node* replace_string);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_REGEXP_H_