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Correct parsing of YieldExpression (#2978)

* [[CHORE]] Factor out Mozilla-specific parsing code

Copy the `yield` parsing logic intended for Mozilla's "JavaScript 1.7"
to a dedicated function. This will reduce the risk of unintended
breaking changes in forthcoming corrections to the parsing logic for the
ECMAScript standard version of the language feature.

* [[CHORE]] Streamline `yield` parsing logic

The previous commit re-factored Mozilla-specific parsing logic for
`yield` to a dedicated function, making it unnecessary to verify the
"inMoz()" value within either version of the parsing function.

* [[FIX]] Correct parsing of YieldExpression

Correct errors in the parsing logic for the ES2015 YieldExpression.
Update invalid unit tests and introduce additional tests.

* fixup! [[CHORE]] Factor out Mozilla-specific parsing code

* fixup! [[CHORE]] Streamline `yield` parsing logic

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