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

[Balázs Kéri via cfe-commits]

balazske wrote:

[This single report](https://codechecker-demo.eastus.cloudapp.azure.com/Default/report-detail?run=qtbase_v6.2.0_fixedaddr_on_test&is-unique=off&diff-type=New&checker-name=alpha.core.FixedAddressDereference&report-hash=fda7750beaa79c7f9c602febcf9a7bb9&report-id=6953322&report-filepath=qtbase%2Fsrc%2Fcorelib%2Fthread%2Fqatomic_bootstrap.h) (qtbase) was detected on the C++ projects (tinyxml2, libwebm, xerces, bitcoin, protobuf, qtbase, contour, acid, openrct2), again a difficult one. Number of "difficult" reports is not less than at some other checkers, so it looks acceptable.

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