[clang] [LifetimeSafety] Track dereference operators for GSL pointers in STL (PR #176643)

[Gábor Horváth via cfe-commits]

================
@@ -99,6 +99,13 @@ bool shouldTrackImplicitObjectArg(const CXXMethodDecl 
*Callee) {
   if (!isGslPointerType(Callee->getFunctionObjectParameterType()) &&
       !isGslOwnerType(Callee->getFunctionObjectParameterType()))
     return false;
+
+  // Track dereference operator for GSL pointers in STL.
+  if (isGslPointerType(Callee->getFunctionObjectParameterType()))
+    if (const CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Callee))
----------------
Xazax-hun wrote:

I am a bit confused here, why do we need this `dyn_cast_or_null` here?

https://github.com/llvm/llvm-project/pull/176643
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