Commits on Jun 19, 2024

1. Add BlackBox …

   Adds a `VolatileCell`-like struct which introduces an optimization
   barrier on all accesses.
   
   The `*Cell`-like `get()` method is the only accessor for the inner value
   and uses a more generalized (i.e. for all `Copy` types) `black_box`
   to preclude optimizations.
   
   This is useful for things like bitwise mask values to ensure LLVM
   doesn't try to optimize around special cases like `0`, especially in the
   context of loops.
   
   For an example use case, see:
   
   https://rustsec.org/advisories/RUSTSEC-2024-0344.html

   

   tarcieri committed Jun 19, 2024
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