Add test case for BigInt in LiteralPropertyName

[mysticatea]

Hello.

This PR adds a test case for BigInt literals in LiteralPropertyName production.

Productions:

LiteralPropertyName > NumericLiteral > DecimalBigIntegerLiteral

Runtime Semantics:

   LiteralPropertyName: NumericLiteral
       1. Let _nbr_ be the NumericValue of |NumericLiteral|.
       1. Return ! ToString(_nbr_).

https://tc39.es/ecma262/#sec-object-initializer-runtime-semantics-evaluation

[mysticatea]

Are there any issues I should address?

[rwaldron]

Please sign the CLA

[mysticatea]

I'm sorry for my late response.

@rwaldron Sorry, how can I sign the CLA? Two links in that page are 404.

[caiolima]

LGTM. I asked a couple of nit changes to make test style better.

[rwaldron]

@mysticatea I linked directly to the CLA in my comment, here it is again: https://tc39.es/test262-cla/. I just did a test signing and the form worked as expected.

[mysticatea]

Thank you for your review. I updated this PR.

@rwaldron Thank you. I have sent the form. That was my mistake -- One of my user scripts had affected the page badly.