handle string literals correctly in match checking

The root of the problem is that a string literal pattern is essentially of
the form `&LITERAL`, in a single block, while match checking wants to
split that.

To fix that, I added a type field to the patterns in match checking,
which allows us to distinguish between a full and split pattern.

That file is ugly and needs to be cleaned. However, `trans::_match` calls
it, so I think we should delay the cleanup until we kill that.

Fixes #30240

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