Rollup merge of #75649 - jyn514:inherent-lang-impls, r=guillaumegomez
Fix intra-doc links for inherent impls that are both lang items and not the default impl I found in https://github.com/rust-lang/rust/pull/75464#issuecomment-675125984 that `str::to_uppercase()` doesn't resolve while `str::trim()` does. The only real difference is that `to_uppercase` is defined in `alloc`, while trim is defined in `core`. It turns out that rustdoc was ignoring `lang_items.str_alloc_impl()` - it saw them in `collect_trait_impls`, but not for intra-doc links. This uses the same `impls` for all parts of rustdoc, so that there can be no more inconsistency. It does have the slight downside that the matches are no longer exhaustive but it will be very clear if a new lang item is missed because it will panic when you try to document it (and if you don't document it, does rustdoc really need to know about it?). ~~This needs a test case (probably just `str::to_uppercase`).~~ Added. This is best reviewed commit-by-commit. r? @GuillaumeGomez
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