[parser] add support for BigInt literal as property names

Fixed: v8:10083
Change-Id: I50e01022b1d1219ad8b31dd71f58f5bc9c9d10bb
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1987845
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65719}

AUTHORS

@@ -68,6 +68,7 @@ Bert Belder <bertbelder@gmail.com>
 Burcu Dogan <burcujdogan@gmail.com>
 Caitlin Potter <caitpotter88@gmail.com>
 Craig Schlenter <craig.schlenter@gmail.com>
+Chengzhong Wu <legendecas@gmail.com>
 Choongwoo Han <cwhan.tunz@gmail.com>
 Chris Nardi <hichris123@gmail.com>
 Christopher A. Taylor <chris@gameclosure.com>

src/parsing/parser-base.h

@@ -2089,6 +2089,14 @@ typename ParserBase<Impl>::ExpressionT ParserBase<Impl>::ParseProperty(
       is_array_index = impl()->IsArrayIndex(prop_info->name, &index);
       break;
     }
+
+    case Token::BIGINT: {
+      Consume(Token::BIGINT);
+      prop_info->name = impl()->GetNumberAsSymbol();
+      is_array_index = impl()->IsArrayIndex(prop_info->name, &index);
+      break;
+    }
+
     case Token::LBRACK: {
       prop_info->name = impl()->NullIdentifier();
       prop_info->is_computed_name = true;

test/mjsunit/harmony/bigint/property-names.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var { 9007199254740991n: it } = { 9007199254740991n: 1 };
+
+assertEquals(it, 1);