Bump MSRV to 1.74 & Drop const_new and arch_legacy#48
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This increases the minimum supported Rust version (MSRV) from Rust 1.59 to Rust 1.74, and drops the following two that are no longer necessary.
Remove
AtomicMaybeUninit::const_newbecauseAtomicMaybeUninit::newis now alwaysconst fnbecause of the MSRV bump.Remove legacy inefficient implementation for pre-1.74 Rust which doesn't support
MaybeUninitregisters inasm!.Note: removing const_new is a breaking change.UPDATE: removal of
const_newhas been reverted in d428f97, andconst_newis now marked as deprecated.