[llvm] [Attributor]: Fix Potential bug when handling PHI in AAPointerInfo (PR #97321)

[Vidush Singhal via llvm-commits]

================
@@ -214,7 +214,7 @@ ChangeStatus clampStateAndIndicateChange<DerefState>(DerefState &S,
 static bool mayBeInCycle(const CycleInfo *CI, const Instruction *I,
                          bool HeaderOnly, Cycle **CPtr = nullptr) {
   if (!CI)
-    return true;
+    return false;
----------------
vidsinghal wrote:

Yeah I see that now, but is there a better way to handle this to avoid simple cases from not being missed?

https://github.com/llvm/llvm-project/pull/97321