[ValueTracking] Drop ucmp/scmp from getIntrinsicRange() (NFCI)

After #135642 we have a range attribute on the intrinsic declaration,
so we should not need the special handling here.

Author: nikic

llvm/lib/Analysis/ValueTracking.cpp

@@ -10146,10 +10146,6 @@ static ConstantRange getRangeForIntrinsic(const IntrinsicInst &II,
     if (!II.getParent() || !II.getFunction())
       break;
     return getVScaleRange(II.getFunction(), Width);
-  case Intrinsic::scmp:
-  case Intrinsic::ucmp:
-    return ConstantRange::getNonEmpty(APInt::getAllOnes(Width),
-                                      APInt(Width, 2));
   default:
     break;
   }