zeroize 1.9.0

Securely clear secrets from memory with a simple trait built on stable Rust primitives which guarantee memory is zeroed using an operation will not be 'optimized away' by the compiler. Uses a portable pure Rust implementation that works everywhere, even WASM!
Documentation 
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//! [`Zeroize`] impls for ARM64 SIMD registers.

use crate::{Zeroize, optimization_barrier, volatile_write};

use core::arch::aarch64::*;

macro_rules! impl_zeroize_for_simd_register {
    ($($type:ty),* $(,)?) => {
        $(
            impl Zeroize for $type {
                #[inline]
                fn zeroize(&mut self) {
                    volatile_write(self, unsafe { core::mem::zeroed() });
                    optimization_barrier(self);
                }
            }
        )+
    };
}

// TODO(tarcieri): other NEON register types?
impl_zeroize_for_simd_register! {
    uint8x8_t,
    uint8x16_t,
    uint16x4_t,
    uint16x8_t,
    uint32x2_t,
    uint32x4_t,
    uint64x1_t,
    uint64x2_t,
}