Fix a bundle of patmat issues #21000
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Some of the issues are legitimate
Previously `defn.ListType.appliedTo(elemTp) <:< pat.tpe` failed when pat.tpe is something like ParamClause, an alias.
Without that, we end up with either a flexible type or a `| Null`.
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Some of the issues are legitimate.
Fixes #20121
Fixes #20122
Fixes #20123
Fixes #20128
Fixes #20129
Fixes #20130
Fixes #20131
Fixes #20132