Slava Pestov b7766b6361 stdlib: Use the original === and !== operators on embedded ...

It seems that the restriction preventing these from working was
lifted.

The behavioral difference is that in Swift 5 mode, we don't
actually open AnyObject like this, so the old operator could
not be used with class-bound existentials.

I added a trivial test case just to ensure that calls to ===
type check correctly in both language modes.

Fixes rdar://156095800.

2025-07-24 15:25:30 -04:00

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