llvm-reduce: Use isCallee helper (#133419)

diff --git a/llvm/tools/llvm-reduce/deltas/ReduceOperandsSkip.cpp b/llvm/tools/llvm-reduce/deltas/ReduceOperandsSkip.cpp
index 1763fee..2a9d40d 100644
--- a/llvm/tools/llvm-reduce/deltas/ReduceOperandsSkip.cpp
+++ b/llvm/tools/llvm-reduce/deltas/ReduceOperandsSkip.cpp
@@ -52,7 +52,7 @@
   if (isa<GEPOperator>(Op.getUser()))
     return false;
   if (auto *CB = dyn_cast<CallBase>(Op.getUser())) {
-    if (&CB->getCalledOperandUse() == &Op)
+    if (CB->isCallee(&Op))
       return false;
   }
   return true;