[clang] [clang][analyzer] Move 'alpha.core.FixedAddressDereference' out of alpha (PR #132404)

[Donát Nagy via cfe-commits]

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

I think the results are good enough to merge this -- a handful of false positives is negligible compared to other checkers. (This checker detects a severe bug, so it's natural that we don't see true positives on stable versions of open source projects.)

https://github.com/llvm/llvm-project/pull/132404