Change how query vtables are constructed. Currently `define_dep_nodes` produces a macro `make_dep_kind_array` that encodes the names of non-queries followed by queries. This macro is used by `make_dep_kind_vtables` to make the full array of vtables, by referring to vtable constructor functions that are put into `mod _dep_kind_vtable_ctors`. Pretty weird! This commit takes advantage of the previous commit's changes to `rustc_with_all_queries`, which makes both query and non-query information available. A new call to `rustc_with_all_queries` is used to construct the vtable array. (This moves some dep_kind_vtable code from `plumbing.rs` to `dep_kind_vtables.rs`, which is good.) It's straightforward now with iterator chaining, and `mod _dep_kind_vtable_ctors` is no longer needed.
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