[InstSimplify] Remove redundant pointer icmp fold (NFCI)

This fold is already performed as part of simplifyICmpWithZero().

llvm/lib/Analysis/InstructionSimplify.cpp

@@ -2736,13 +2736,6 @@ static Constant *computePointerICmp(CmpInst::Predicate Pred, Value *LHS,
   const TargetLibraryInfo *TLI = Q.TLI;
   const DominatorTree *DT = Q.DT;
   const Instruction *CxtI = Q.CxtI;
-  const InstrInfoQuery &IIQ = Q.IIQ;
-
-  // A non-null pointer is not equal to a null pointer.
-  if (isa<ConstantPointerNull>(RHS) && ICmpInst::isEquality(Pred) &&
-      llvm::isKnownNonZero(LHS, DL, 0, nullptr, nullptr, nullptr,
-                           IIQ.UseInstrInfo))
-    return ConstantInt::get(getCompareTy(LHS), !CmpInst::isTrueWhenEqual(Pred));
 
   // We can only fold certain predicates on pointer comparisons.
   switch (Pred) {