fix(vsimd): fix debug_assert lint error in transmute_copy

[Copilot]

Fixes a clippy lint error and addresses an alignment safety issue in the transmute_copy() function.

Changes

• Replaced debug_assert! with debug_assert_eq! for size comparison in transmute_copy()
• Added alignment assertion to prevent UB when B has stricter alignment than A

Before

debug_assert!(core::mem::size_of::<A>() == core::mem::size_of::<B>());
*(core::ptr::from_ref::<A>(a) as *const B)

After

debug_assert_eq!(core::mem::size_of::<A>(), core::mem::size_of::<B>());
debug_assert!(core::mem::align_of::<B>() <= core::mem::align_of::<A>());
*(core::ptr::from_ref::<A>(a) as *const B)

The alignment assertion ensures that the pointer cast is safe by verifying B's alignment requirement does not exceed A's. Since a reference to A is guaranteed to be aligned for A, if B has equal or weaker alignment, the cast is safe.

[Copilot]

Pull request overview

This PR addresses a Clippy lint failure in vsimd by switching a size equality check from debug_assert! to the more appropriate debug_assert_eq! within an unsafe transmute helper.

Changes:

• Replaced debug_assert!(size_of::<A>() == size_of::<B>()) with debug_assert_eq!(size_of::<A>(), size_of::<B>()) in transmute_copy<A, B>().

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