Implicitly pass 'scope()' as parent scope for function scopes

src/parsing/parser.h

Index: src/parsing/parser.h
diff --git a/src/parsing/parser.h b/src/parsing/parser.h
index 9ba68953e28b0dccfac1e97a69efba0698636a6c..15fb310b030f67c87f5b5c947f81210a98dedfc3 100644
--- a/src/parsing/parser.h
+++ b/src/parsing/parser.h
@@ -543,7 +543,7 @@ class ParserTraits {
       Type::ExpressionClassifier* classifier, int pos, bool* ok);
 
   V8_INLINE Scope* NewScope(Scope* parent_scope, ScopeType scope_type);
-  V8_INLINE Scope* NewFunctionScope(Scope* parent_scope, FunctionKind kind);
+  V8_INLINE Scope* NewFunctionScope(FunctionKind kind);
 
   V8_INLINE void AddFormalParameter(ParserFormalParameters* parameters,
                                     Expression* pattern,
@@ -1048,7 +1048,7 @@ class Parser : public ParserBase<ParserTraits> {
 
   // Factory methods.
   FunctionLiteral* DefaultConstructor(const AstRawString* name, bool call_super,
-                                      Scope* scope, int pos, int end_pos,
+                                      int pos, int end_pos,
                                       LanguageMode language_mode);
 
   // Skip over a lazy function, either using cached data if we have it, or
@@ -1147,8 +1147,8 @@ Scope* ParserTraits::NewScope(Scope* parent_scope, ScopeType scope_type) {
   return parser_->NewScope(parent_scope, scope_type);
 }
 
-Scope* ParserTraits::NewFunctionScope(Scope* parent_scope, FunctionKind kind) {
-  return parser_->NewFunctionScope(parent_scope, kind);
+Scope* ParserTraits::NewFunctionScope(FunctionKind kind) {
+  return parser_->NewFunctionScope(kind);
 }
 
 const AstRawString* ParserTraits::EmptyIdentifierString() {