Backport "Don't re-balance AndTypes arising from supertypes" to LTS #21124
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#20284 started breaking since we now balance AndTypes to avoid performance drops. But (re-)balancing an AndType interferes with the logic that determines which symbol is referred by a super select. This is fixed by two changes: - Form types of super with `AndType` instead of `&` - Don't simplify types of super since that would rebalance the underlying AndTypes. Fixes #20284 [Cherry-picked f0560b2]
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No regressions detected in the community build up to lts-20857. |
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Backports #20400 to the LTS branch.
PR submitted by the release tooling.
[skip ci]