[clang] [analyzer] Suppress core.FixedAddressDereference reports with volatile pointee (PR #181644)

[Donát Nagy via cfe-commits]

https://github.com/NagyDonat approved this pull request.

LGTM, makes sense.

(I didn't look at the motivation links, I just reviewed the code itself.)

https://github.com/llvm/llvm-project/pull/181644