[LV][VPlan] Change the inheritance of class VPWidenSelectRecipe to class VPRecipeWithIRFlags, which allows recipe of the select to pass the fastmath flags

The patch of #119847 will add the fastmath flag to for recipe

Author: LiqinWeng

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -1807,11 +1807,10 @@ class VPHistogramRecipe : public VPRecipeBase {
 };
 
 /// A recipe for widening select instructions.
-struct VPWidenSelectRecipe : public VPSingleDefRecipe {
+struct VPWidenSelectRecipe : public VPRecipeWithIRFlags {
   template <typename IterT>
   VPWidenSelectRecipe(SelectInst &I, iterator_range<IterT> Operands)
-      : VPSingleDefRecipe(VPDef::VPWidenSelectSC, Operands, &I,
-                          I.getDebugLoc()) {}
+      : VPRecipeWithIRFlags(VPDef::VPWidenSelectSC, Operands, I) {}
 
   ~VPWidenSelectRecipe() override = default;
 

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1171,6 +1171,7 @@ void VPWidenSelectRecipe::print(raw_ostream &O, const Twine &Indent,
   O << Indent << "WIDEN-SELECT ";
   printAsOperand(O, SlotTracker);
   O << " = select ";
+  printFlags(O);
   getOperand(0)->printAsOperand(O, SlotTracker);
   O << ", ";
   getOperand(1)->printAsOperand(O, SlotTracker);

llvm/test/Transforms/LoopVectorize/select-with-Fastflags.ll

@@ -22,7 +22,7 @@ define void @select_with_fastmath_flags(ptr noalias %a, ptr noalias %b, ptr noal
 ; FAST-NEXT:     WIDEN ir<[[LD2:%.+]]> = load vp<[[PTR2]]>
 ; FAST-NEXT:     WIDEN ir<[[FCMP:%.+]]> = fcmp ogt ir<[[LD1]]>, ir<[[LD2]]>
 ; FAST-NEXT:     WIDEN ir<[[FADD:%.+]]> = fadd reassoc nnan ninf nsz arcp contract afn ir<[[LD1]]>, ir<1.000000e+01>
-; FAST-NEXT:     WIDEN-SELECT ir<[[SELECT:%.+]]> = select ir<[[FCMP]]>, ir<[[FADD]]>, ir<[[LD2]]>
+; FAST-NEXT:     WIDEN-SELECT ir<[[SELECT:%.+]]> = select reassoc nnan ninf nsz arcp contract afn ir<[[FCMP]]>, ir<[[FADD]]>, ir<[[LD2]]>
 ; FAST-NEXT:     CLONE ir<[[GEP3:%.+]]> = getelementptr inbounds nuw ir<%a>, vp<[[ST]]>
 ; FAST-NEXT:     vp<[[PTR3:%.+]]> = vector-pointer ir<[[GEP3]]>
 ; FAST-NEXT:     WIDEN store vp<[[PTR3]]>, ir<[[SELECT]]>