Backport "Re-use isConcrete checking in match types for NamedTuple.From" to 3.5.2 #21447
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- Move isConcrete to a new object `MatchTypes`. We should also move other MatchType-related stuff from Types and TypeComparer here. Type and TypeComparer are already unconfortably big, and MatchTypes are a coherent topic where everything should work together. - Streamline isConcrete a bit. - Re-use isConcrete for a similar test in CheckRealizable. - Re-use isConcrete for evaluating NamedTuple.From Fixes #20517 [Cherry-picked 532a9da]
[Cherry-picked de34efe]
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Backports #20947 to the 3.5.2 branch.
PR submitted by the release tooling.
[skip ci]