Backport "Fix a bundle of patmat issues" to 3.5.2 #21478
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[Cherry-picked 4f22672]
[Cherry-picked 3ba51a6]
Some of the issues are legitimate [Cherry-picked b56da91]
[Cherry-picked 7183bb2]
[Cherry-picked 8df91fa]
Previously `defn.ListType.appliedTo(elemTp) <:< pat.tpe` failed when pat.tpe is something like ParamClause, an alias. [Cherry-picked e160de7]
Without that, we end up with either a flexible type or a `| Null`. [Cherry-picked 5fd810e]
[Cherry-picked 4dd8e8a]
[Cherry-picked 5b425ee]
[Cherry-picked ab240f1]
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Backports #21000 to the 3.5.2 branch.
PR submitted by the release tooling.
[skip ci]