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

src/parsing/preparser.cc

Index: src/parsing/preparser.cc
diff --git a/src/parsing/preparser.cc b/src/parsing/preparser.cc
index 51914874a9221c859816dfbf39e87203e973e1db..8c208b42f1e26dd75779e051b40bcfe14e81d180 100644
--- a/src/parsing/preparser.cc
+++ b/src/parsing/preparser.cc
@@ -136,7 +136,7 @@ PreParser::PreParseResult PreParser::PreParseLazyFunction(
   FunctionState top_state(&function_state_, &scope_state_, top_scope,
                           kNormalFunction, &top_factory);
   scope()->SetLanguageMode(language_mode);
-  Scope* function_scope = NewFunctionScope(scope(), kind);
+  Scope* function_scope = NewFunctionScope(kind);
   if (!has_simple_parameters) function_scope->SetHasNonSimpleParameters();
   PreParserFactory function_factory(nullptr);
   FunctionState function_state(&function_state_, &scope_state_, function_scope,
@@ -1111,7 +1111,7 @@ PreParser::Expression PreParser::ParseFunctionLiteral(
 
   // Parse function body.
   bool outer_is_script_scope = scope()->is_script_scope();
-  Scope* function_scope = NewFunctionScope(scope(), kind);
+  Scope* function_scope = NewFunctionScope(kind);
   function_scope->SetLanguageMode(language_mode);
   PreParserFactory factory(NULL);
   FunctionState function_state(&function_state_, &scope_state_, function_scope,