test: syntax error if superproperty private name access

[jbhoosreddy]

Tracking issues #1343

Summary of changes:

1. Add test for super property private name early syntax error

[jbhoosreddy]

@leobalter @rwaldron @littledan @mkubilayk for review

[jbhoosreddy]

@leobalter @rwaldron for review?

[leobalter]

Rick is off this week due to family obligations. I don't have any time assigned this week to review PRs and I'm pretty busy with other things. We should be able to review this one next week.

[rwaldron]

When I generate these tests, I get the following:

throw "Test262: This statement should not be evaluated.";

class C extends B
{
  method() {
  super.#x();
  }
}

Which will pass by throwing a SyntaxError exception, but it's a false positive:

Uncaught SyntaxError: Invalid private field '#x'

The reason I believe this is a false positive is due this being the same exception that occurs for this:

class C extends B
{
  method() {
  this.#x();
  }
}

Uncaught SyntaxError: Invalid private field '#x'

But then I realized that the case doesn't have any label on this:

class B {
#x() {}
}

So it's not being included.

[rwaldron]

I actually don't think this:

class B {
#x() {}
}

...is even necessary. Since the test is just "expect super.#x() to result in a SyntaxError", there doesn't even need to be a class declaration for B.

I no longer believe that the failure is a false positive.

[jbhoosreddy]

@rwaldron based on your last comment is there something I needed to fix in my PR?