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resolve: Tweak `private_macro_use` lint to be compatible with upcoming macro prelude changes Unblocks https://github.com/rust-lang/rust/pull/139493. Zulip thread requesting help - [#t-compiler/help > Help requested for effects of #139493](https://rust-lang.zulipchat.com/#narrow/channel/182449-t-compiler.2Fhelp/topic/Help.20requested.20for.20effects.20of.20.23139493/with/514653911). This PR by itself shouldn't cause any observable changes, its only observable effect is that the prelude changes from https://github.com/rust-lang/rust/pull/139493 will no longer cause regressions in tests like `tests/ui/imports/issue-119369.rs` or `tests/ui/extern/issue-80074.rs`. This is achieved by moving the "is this thing in stdlib prelude" check from an early point (`fn process_macro_use_imports`) to a later point (`fn record_use_inner`), at which the stdlib prelude is already populated and can be inspected. (The `is_builtin_macro` check is subsumed by the stdlib prelude check, all built-in macros go through the stdlib prelude anyway.)