[LV] Don't adjust name of recurrence phi in scalar loop (NFC).

Adjusting the name of the recurrence phi in the scalar loop is a bit
inconsistent, as we do not adjust any other names in the scalar loops
(including other phis).

Remove this adjustment in preparation for
llvm#94760 and as discussed there.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -3390,7 +3390,6 @@ void InnerLoopVectorizer::fixFixedOrderRecurrence(VPLiveOut *LO,
   }
   ScalarHeaderPhi->setIncomingValueForBlock(LoopScalarPreHeader,
                                             ScalarPreheaderPhi);
-  ScalarHeaderPhi->setName("scalar.recur");
 }
 
 void InnerLoopVectorizer::sinkScalarOperands(Instruction *PredInst) {

llvm/test/Transforms/LoopVectorize/pr36983.ll

@@ -3,8 +3,8 @@
 ; There could be more than one LCSSA PHIs in loop exit block.
 
 ; CHECK-LABEL: bb1.bb3_crit_edge:
-; CHECK: %_tmp133.lcssa1 = phi i16 [ %scalar.recur, %bb2 ], [ %vector.recur.extract.for.phi, %middle.block ]
-; CHECK: %_tmp133.lcssa = phi i16 [ %scalar.recur, %bb2 ], [ %vector.recur.extract.for.phi, %middle.block ]
+; CHECK: %_tmp133.lcssa1 = phi i16 [ %_tmp133, %bb2 ], [ %vector.recur.extract.for.phi, %middle.block ]
+; CHECK: %_tmp133.lcssa = phi i16 [ %_tmp133, %bb2 ], [ %vector.recur.extract.for.phi, %middle.block ]
 
 define void @f1() {
 bb2.lr.ph: