Add a mode to completely deserialize scope chains

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 603b6c8a33cc78ddbd753511bf0661fe29536845..4bb4038304f0c27be2990dac692e63f552b19e03 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -947,9 +947,9 @@ FunctionLiteral* Parser::DoParseProgram(ParseInfo* info) {
     Scope* scope = NewScriptScope();
     info->set_script_scope(scope);
     if (!info->context().is_null() && !info->context()->IsNativeContext()) {
-      scope = Scope::DeserializeScopeChain(info->isolate(), zone(),
-                                           *info->context(), scope,
-                                           ast_value_factory());
+      scope = Scope::DeserializeScopeChain(
+          info->isolate(), zone(), *info->context(), scope, ast_value_factory(),
+          Scope::DeserializationMode::kKeepScopeInfo);
       // The Scope is backed up by ScopeInfo (which is in the V8 heap); this
       // means the Parser cannot operate independent of the V8 heap. Tell the
       // string table to internalize strings and values right after they're
@@ -1116,8 +1116,9 @@ FunctionLiteral* Parser::ParseLazy(Isolate* isolate, ParseInfo* info,
       // Ok to use Isolate here, since lazy function parsing is only done in the
       // main thread.
       DCHECK(parsing_on_main_thread_);
-      scope = Scope::DeserializeScopeChain(isolate, zone(), *info->context(),
-                                           scope, ast_value_factory());
+      scope = Scope::DeserializeScopeChain(
+          isolate, zone(), *info->context(), scope, ast_value_factory(),
+          Scope::DeserializationMode::kKeepScopeInfo);
     }
     original_scope_ = scope;
     FunctionState function_state(&function_state_, &scope_state_, scope,