[VP] IR expansion to Int Func Call (#122867)

Add basic handling for VP ops that can expand to Int intrinsics, which
includes: ctpop/cttz/ctlz/sadd.sat/uadd.sat/ssub.sat/usub.sat/fshl/fshr

Author: LiqinWeng

llvm/lib/CodeGen/ExpandVectorPredication.cpp

@@ -609,6 +609,15 @@ Value *CachingVPExpander::expandPredication(VPIntrinsic &VPI) {
   case Intrinsic::vp_umin:
   case Intrinsic::vp_bswap:
   case Intrinsic::vp_bitreverse:
+  case Intrinsic::vp_ctpop:
+  case Intrinsic::vp_ctlz:
+  case Intrinsic::vp_cttz:
+  case Intrinsic::vp_sadd_sat:
+  case Intrinsic::vp_uadd_sat:
+  case Intrinsic::vp_ssub_sat:
+  case Intrinsic::vp_usub_sat:
+  case Intrinsic::vp_fshl:
+  case Intrinsic::vp_fshr:
     return expandPredicationToIntCall(Builder, VPI);
   case Intrinsic::vp_fabs:
   case Intrinsic::vp_sqrt: