[regexp] Properly handle HeapNumbers in AdvanceStringIndex

src/builtins/builtins-regexp.h

Index: src/builtins/builtins-regexp.h
diff --git a/src/builtins/builtins-regexp.h b/src/builtins/builtins-regexp.h
index f14a41e051fbd4aba01aae6f7f14dd5227a2980a..2f530874d304e4d39628980d21d730c1338f230b 100644
--- a/src/builtins/builtins-regexp.h
+++ b/src/builtins/builtins-regexp.h
@@ -73,7 +73,7 @@ class RegExpBuiltinsAssembler : public CodeStubAssembler {
   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);