Add the ability to deduplicate hoisted expressions, which will be
necessary to avoid repeatedly hoisting the same descriptors and blowing
our budget. The offset calculation may have itself been hoisted into the
preamble, so we also have to be able to hoist a bindless_resource_ir3
referencing a load_preamble and connect it to the source of the
corresponding store_preamble.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29873>
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