Move function length tracking from Scope to (Pre)?ParserFormalParameters.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index b7fa0b2c5e577cdb6988edb8934eb98f6c49f4b8..cbdcec8213979cd75e684447bb2c3b5c02554dc2 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -13728,7 +13728,7 @@ void SharedFunctionInfo::InitFromFunctionLiteral(
     Handle<SharedFunctionInfo> shared_info, FunctionLiteral* lit) {
   // When adding fields here, make sure DeclarationScope::AnalyzePartially is
   // updated accordingly.
-  shared_info->set_length(lit->scope()->arity());
+  shared_info->set_length(lit->function_length());
   shared_info->set_internal_formal_parameter_count(lit->parameter_count());
   shared_info->set_function_token_position(lit->function_token_position());
   shared_info->set_start_position(lit->start_position());