Auto merge of #158604 - LorrensP-2158466:less-alloc-during-res, r=petrochenkov resolve: no allocation in `resolve_ident_in(_local)_module_*` Somewhat of a follow up of rust-lang/rust#158207 and rust-lang/rust#158035. Remove the `or_default` call of `NameResolutions` which does an arena allocation. Prep work for parallel import resolution. - cycle detection now works on `module` and `bindingkey` instead of the `NameResolution`. This should have no impact as `NameResolutions` are found by that pair. - Now that we get an `Option<NameResolution>` the logic changed a bit to work with `None`. Did this by following the logic of the functions to see what would happen with a completely empty resolution (`or_default`). r? @petrochenkov
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