Ben Barham d51c58a6f9 [Basic] hasFeature should succeed for promoted language features ...

Merge `$<Feature>` and `hasFeature` implementations.
  - `$<Feature>` did not support upcoming language features.
  - `hasFeature` did not support promoted language features and also
    didn't take into account `Options` in `Features.def`.

Remove `Options` entirely, it was always one of three cases:
  - `true`
  - `langOpts.hasFeature`
  - `hasSwiftSwiftParser`

Since `LangOptions::hasFeature` should always be used anyway, it's no
longer necessary. `hasSwiftSwiftParser` can be special cased when adding
the default promoted language features (by removing those features).

Resolves rdar://117917456.

2024-01-05 10:26:13 -08:00

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