[DAGCombiner] Remove TRUNCATE_(S/U)SAT_(S/U) from an assert that isn't tested. NFC (#104466)

Author: topperc

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -13201,9 +13201,7 @@ SDValue DAGCombiner::matchVSelectOpSizesWithSetCC(SDNode *Cast) {
   unsigned CastOpcode = Cast->getOpcode();
   assert((CastOpcode == ISD::SIGN_EXTEND || CastOpcode == ISD::ZERO_EXTEND ||
           CastOpcode == ISD::TRUNCATE || CastOpcode == ISD::FP_EXTEND ||
-          CastOpcode == ISD::TRUNCATE_SSAT_S ||
-          CastOpcode == ISD::TRUNCATE_SSAT_U ||
-          CastOpcode == ISD::TRUNCATE_USAT_U || CastOpcode == ISD::FP_ROUND) &&
+          CastOpcode == ISD::FP_ROUND) &&
          "Unexpected opcode for vector select narrowing/widening");
 
   // We only do this transform before legal ops because the pattern may be