Use NonNull<u8> for pc instead of *mut u8

[Kmeakin]

Split off from #9251

[Kmeakin]

The methods on NonNull were stabilized in 1.80, so we'll have to wait until 1.82 is released on 17 October and use pollyfills in the meantime

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[alexcrichton]

We're unfortunately held back on Rust versions by OSS-Fuzz right now (see #9231 for a bit more info), so it might be best to go ahead and get this working on our current 1.78 MSRV. I think it may just require a few more accessor methods in a few places? (e.g. .as_ptr().read() instead of .read())

[Kmeakin]

We're unfortunately held back on Rust versions by OSS-Fuzz right now (see #9231 for a bit more info), so it might be best to go ahead and get this working on our current 1.78 MSRV. I think it may just require a few more accessor methods in a few places? (e.g. .as_ptr().read() instead of .read())

Should pass on 1.78 rust with the newest patch

[alexcrichton]

Oh oops sorry I think I missed the update