Remove is_parenthesized bit from Expression and PreParserExpression

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index 83c8375197db75ad352b8bbb98a3fd587825ac3c..e44ebe01f4f6e4ee4d7e010c6ba808dc4480da26 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -1312,7 +1312,9 @@ ParserBase<Traits>::ParsePrimaryExpression(ExpressionClassifier* classifier,
       if (!classifier->is_valid_binding_pattern()) {
         ArrowFormalParametersUnexpectedToken(classifier);
       }
-      BindingPatternUnexpectedToken(classifier);
+      classifier->RecordPatternError(scanner()->peek_location(),
+                                     MessageTemplate::kUnexpectedToken,
+                                     Token::String(Token::LPAREN));
       Consume(Token::LPAREN);
       if (Check(Token::RPAREN)) {
         // ()=>x.  The continuation that looks for the => is in
@@ -1356,9 +1358,6 @@ ParserBase<Traits>::ParsePrimaryExpression(ExpressionClassifier* classifier,
       ExpressionT expr = this->ParseExpression(true, kIsPossibleArrowFormals,
                                                classifier, CHECK_OK);
       Expect(Token::RPAREN, CHECK_OK);
-      if (peek() != Token::ARROW) {
-        expr->set_is_parenthesized();
-      }
       return expr;
     }
 
@@ -2025,8 +2024,7 @@ ParserBase<Traits>::ParseAssignmentExpression(bool accept_IN, int flags,
           ExpressionClassifier::CoverInitializedNameProduction);
 
   bool maybe_pattern =
-      (expression->IsObjectLiteral() || expression->IsArrayLiteral()) &&
-      !expression->is_parenthesized();
+      expression->IsObjectLiteral() || expression->IsArrayLiteral();
 
   if (!Token::IsAssignmentOp(peek())) {
     // Parsed conditional expression only (no assignment).
@@ -3314,9 +3312,6 @@ void ParserBase<Traits>::CheckDestructuringElement(
   const Scanner::Location location(begin, end);
   if (expression->IsArrayLiteral() || expression->IsObjectLiteral() ||
       expression->IsAssignment()) {
-    if (expression->is_parenthesized()) {
-      classifier->RecordPatternError(location, message);
-    }
     return;
   }