Backport "Fix isomorphism tests of AndOrTypes under non-empty BinderPairs" to 3.5.2
#21468
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[Cherry-picked fc1ce14]
…21017) Before the changes, when comparing two `HKTypeLambda` result types, the list of binding pairs was lost when entering comparison of `AndOrType`s, which caused the `equals` to fail, and hence prevented hash-consing. Even though `M1` and `M2` in pos/i20858-min should still conform to one-another, we entered a deep-subtype comparison because of the order in which the TypeComparer does dealiasing of AppliedTypes, and comparison of MatchCases and AndTypes. Fix #20858 [Cherry-picked f2829c3]
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Backports #21017 to the 3.5.2 branch.
PR submitted by the release tooling.
[skip ci]