[RISCV][TTI] Add cost of type based binOp VP intrinsics with functionalOPC. (#93435)

Intrinsics not supported in the backend will fall Into BasicTTIImpl,
which will check if the VP intrinsic is a type based instruction.
All type based instruction will fall into the
`getTypeBasedIntrinsicInstrCost()` which doesn't support instruction
with scalable vector type.

This patch adds the instruction cost for type based binOp VP intrinsic
instructions in the backend to get the valid instruction costs.
The cost of type based binOp VP intrinsics will be same as their non-VP
counterpart.

Author: ElvisWang123

llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

@@ -959,6 +959,32 @@ RISCVTTIImpl::getIntrinsicInstrCost(const IntrinsicCostAttributes &ICA,
       return Cost * LT.first;
     break;
   }
+  // vp integer arithmetic ops.
+  case Intrinsic::vp_add:
+  case Intrinsic::vp_and:
+  case Intrinsic::vp_ashr:
+  case Intrinsic::vp_lshr:
+  case Intrinsic::vp_mul:
+  case Intrinsic::vp_or:
+  case Intrinsic::vp_sdiv:
+  case Intrinsic::vp_shl:
+  case Intrinsic::vp_srem:
+  case Intrinsic::vp_sub:
+  case Intrinsic::vp_udiv:
+  case Intrinsic::vp_urem:
+  case Intrinsic::vp_xor:
+  // vp float arithmetic ops.
+  case Intrinsic::vp_fadd:
+  case Intrinsic::vp_fsub:
+  case Intrinsic::vp_fmul:
+  case Intrinsic::vp_fdiv:
+  case Intrinsic::vp_frem: {
+    std::optional<unsigned> FOp =
+        VPIntrinsic::getFunctionalOpcodeForVP(ICA.getID());
+    if (FOp)
+      return getArithmeticInstrCost(*FOp, ICA.getReturnType(), CostKind);
+    break;
+  }
   }
 
   if (ST->hasVInstructions() && RetTy->isVectorTy()) {