[clang] [analyzer][NFCI] Move the core.FixedAddressDereference checker to optin.core (PR #181858)

[Balázs Benics via cfe-commits]

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@@ -1,4 +1,4 @@
-// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.core -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.core.FixedAddr,optin.core.FixedAddressDereference -verify %s
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steakhal wrote:

At first glance, that checker is so bad that we should just remove it.

https://github.com/llvm/llvm-project/pull/181858