[clang] [clang][analyzer] Add checker 'alpha.core.FixedAddressDereference' (PR #127191)

[Balázs Kéri via cfe-commits]

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@@ -129,6 +129,8 @@ The ``SuppressAddressSpaces`` option suppresses
 warnings for null dereferences of all pointers with address spaces. You can
 disable this behavior with the option
 ``-analyzer-config core.NullDereference:SuppressAddressSpaces=false``.
+Value of this option is used for checker
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balazske wrote:

This is not an ideal solution, later (maybe before this checker becomes non-alpha) we can add an analyzer option (in this case the checker option is removed from the non-alpha NullDereference checker, can this be a problem?). 

https://github.com/llvm/llvm-project/pull/127191