Backport #15625: Fix two problems related to match types as array elements #15761
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1. The erasure of an array of matchtypes should sometimes be Object
instead of Object[]
2. Classtags of matchtypes can be created only if all alternatives
produce the same classtag.
About 1: If a matchtype with alternative types A_1, ... A_n is an array element,
it should be treated in the same way as the type ? <: A_1 | ... | A_n. It's an
_unknown_ subtype of A_1 | ... | A_n. That can cause the erasure of the underlying
array to be Object.
Fixes scala#15618
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Backports #15625