[VPlan] Strip stray whitespace when printing VPWidenSelectRecipe. (NFCI)

printFlags takes care of inserting the correct amount of spaces,
depending on whether there are flags to print or not.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp

@@ -1908,7 +1908,7 @@ void VPWidenSelectRecipe::printRecipe(raw_ostream &O, const Twine &Indent,
                                       VPSlotTracker &SlotTracker) const {
   O << Indent << "WIDEN-SELECT ";
   printAsOperand(O, SlotTracker);
-  O << " = select ";
+  O << " = select";
   printFlags(O);
   getOperand(0)->printAsOperand(O, SlotTracker);
   O << ", ";

llvm/test/Transforms/LoopVectorize/vplan-printing.ll

@@ -97,7 +97,7 @@ define void @print_widen_gep_and_select(i64 %n, ptr noalias %y, ptr noalias %x,
 ; CHECK-NEXT:   vp<[[VEC_PTR:%.+]]> = vector-pointer inbounds ir<%arrayidx>
 ; CHECK-NEXT:   WIDEN ir<%lv> = load vp<[[VEC_PTR]]>
 ; CHECK-NEXT:   WIDEN ir<%cmp> = icmp eq ir<%arrayidx>, ir<%z>
-; CHECK-NEXT:   WIDEN-SELECT ir<%sel> = select  ir<%cmp>, ir<1.000000e+01>, ir<2.000000e+01>
+; CHECK-NEXT:   WIDEN-SELECT ir<%sel> = select ir<%cmp>, ir<1.000000e+01>, ir<2.000000e+01>
 ; CHECK-NEXT:   WIDEN ir<%add> = fadd ir<%lv>, ir<%sel>
 ; CHECK-NEXT:   CLONE ir<%arrayidx2> = getelementptr inbounds ir<%x>, vp<[[STEPS]]>
 ; CHECK-NEXT:   vp<[[VEC_PTR2:%.+]]> = vector-pointer inbounds ir<%arrayidx2>
@@ -1029,7 +1029,7 @@ define void @print_select_with_fastmath_flags(ptr noalias %a, ptr noalias %b, pt
 ; CHECK-NEXT:     WIDEN ir<[[LD2:%.+]]> = load vp<[[PTR2]]>
 ; CHECK-NEXT:     WIDEN ir<[[FCMP:%.+]]> = fcmp ogt fast ir<[[LD1]]>, ir<[[LD2]]>
 ; CHECK-NEXT:     WIDEN ir<[[FADD:%.+]]> = fadd fast ir<[[LD1]]>, ir<1.000000e+01>
-; CHECK-NEXT:     WIDEN-SELECT ir<[[SELECT:%.+]]> = select  fast ir<[[FCMP]]>, ir<[[FADD]]>, ir<[[LD2]]>
+; CHECK-NEXT:     WIDEN-SELECT ir<[[SELECT:%.+]]> = select fast ir<[[FCMP]]>, ir<[[FADD]]>, ir<[[LD2]]>
 ; CHECK-NEXT:     CLONE ir<[[GEP3:%.+]]> = getelementptr inbounds nuw ir<%a>, vp<[[ST]]>
 ; CHECK-NEXT:     vp<[[PTR3:%.+]]> = vector-pointer inbounds nuw ir<[[GEP3]]>
 ; CHECK-NEXT:     WIDEN store vp<[[PTR3]]>, ir<[[SELECT]]>