[clang] [clang][analyzer] Less redundant warnings from FixedAddressChecker (PR #110458)

[Donát Nagy via cfe-commits]

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

Looks good to me, nice little improvement :)

I reworded a comment in an inline suggestion because I felt that it was a bit difficult to understand; but feel free to change it further if you'd prefer.

https://github.com/llvm/llvm-project/pull/110458