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Extract `for_each_immediate_subpat` from THIR pattern visitors This is extracted from some larger changes I've been working on, trying to introduce a “THIR pattern id” to refer to THIR pattern nodes without a direct reference. The future of those changes is somewhat uncertain, due to some [proposed changes involving upvar inference](https://rust-lang.zulipchat.com/#narrow/channel/131828-t-compiler/topic/upvar.20inference.20on.20THIR.3F). So I'm taking my preparatory changes that make sense on their own, and extracting them into one or more independent PRs. --- This particular patch takes two different functions that were both matching on `PatKind` to traverse subpatterns, and extracts the core match into a single helper function.
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