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`#[naked]`: use an allowlist for allowed options on `asm!` in naked functions tracking issue: https://github.com/rust-lang/rust/issues/90957 this is mostly just a refactor, but using an allowlist (rather than a denylist) for which asm options are allowed in naked functions is a little safer. These options are disallowed because naked functions are effectively global asm, but defined using inline asm.