Remove is_parenthesized bit from Expression and PreParserExpression

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 67c6bd2a69225dae0f411884bc2a7e17dde2e7a4..b020fb00d95e188149b93240be368e92e98e76a6 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -279,12 +279,6 @@ class PreParserExpression {
   int position() const { return RelocInfo::kNoPosition; }
   void set_function_token_position(int position) {}
 
-  // Parenthesized expressions in the form `( Expression )`.
-  void set_is_parenthesized() {
-    code_ = ParenthesizedField::update(code_, true);
-  }
-  bool is_parenthesized() const { return ParenthesizedField::decode(code_); }
-
  private:
   enum Type {
     kExpression,