Rescope arrow-function parameter lists by moving the delta to the parameter scope

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 31ebdbe0f994e8c2010ef371518be54e48dd5744..4ab075e052c48070a5814ab1b5c4dfbf5d57817a 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -558,8 +558,8 @@ class ParserTraits {
                                           bool* ok);
   void ParseArrowFunctionFormalParameterList(
       ParserFormalParameters* parameters, Expression* params,
-      const Scanner::Location& params_loc,
-      Scanner::Location* duplicate_loc, bool* ok);
+      const Scanner::Location& params_loc, Scanner::Location* duplicate_loc,
+      const Scope::Snapshot& scope_snapshot, bool* ok);
 
   V8_INLINE Expression* ParseAsyncFunctionExpression(bool* ok);