Crate zeroizing_alloc

An example crate showing how to safely and performantly zero out all heap allocations in a process.

This crates makes the following changes from common zeroizing alloc implementations:

• Introduce a faster zeroization implementation (original kept behind feature “reference_impl” for perf testing)
• Fix a potential casting bug
• Remove unit tests: although passing locally, they trigger UAF and UB, leading to inconsistency, which we don’t want.
  • Used MIRIFLAGS="-Zmiri-ignore-leaks" cargo +nightly miri test -p op-alloc

https://rust.godbolt.org was a tool used to partially verify that zeroization will NOT be optimized out at -Copt-level=3

Structs

• ZeroAlloc
  Allocator wrapper that zeros on free