[clang] [llvm] [analyzer] Delete `alpha.security.MallocOverflow` (PR #103059)

[Artem Dergachev via cfe-commits]

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@@ -1039,10 +1039,6 @@ def ArrayBoundCheckerV2 : Checker<"ArrayBoundV2">,
   HelpText<"Warn about buffer overflows (newer checker)">,
   Documentation<HasDocumentation>;
 
-def MallocOverflowSecurityChecker : Checker<"MallocOverflow">,
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haoNoQ wrote:

We could keep this for a while to avoid breaking people's configurations, but given that the checker was alpha we're probably not strictly obliged to do that.

https://github.com/llvm/llvm-project/pull/103059