[VPlan] Consistently use DEBUG_TYPE loop-vectorize.

This ensures debug messages in VPlan.cpp are included in the commonly
used -debug-only=loop-vectorize.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlan.cpp

@@ -58,7 +58,7 @@ static cl::opt<bool> PrintVPlansInDotFormat(
     "vplan-print-in-dot-format", cl::Hidden,
     cl::desc("Use dot format instead of plain text when dumping VPlans"));
 
-#define DEBUG_TYPE "vplan"
+#define DEBUG_TYPE "loop-vectorize"
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
 raw_ostream &llvm::operator<<(raw_ostream &OS, const VPValue &V) {

llvm/test/Transforms/LoopVectorize/RISCV/riscv-vector-reverse.ll

@@ -1,4 +1,3 @@
-; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
 ; This is the loop in c++ being vectorize in this file with
 ;vector.reverse
 ;  #pragma clang loop vectorize_width(4, scalable)
@@ -195,12 +194,7 @@ define void @vector_reverse_i64(ptr nocapture noundef writeonly %A, ptr nocaptur
 ; CHECK:         IR   %indvars.iv.next = add nsw i64 %indvars.iv, -1
 ; CHECK-NEXT:  No successors
 ; CHECK-NEXT:  }
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Interleaving disabled by the pass manager
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Vectorizing: innermost loop.
-; CHECK-EMPTY:
+; CHECK:  LV: Loop does not require scalar epilogue
 ;
 entry:
   %cmp7 = icmp sgt i32 %n, 0
@@ -414,11 +408,7 @@ define void @vector_reverse_f32(ptr nocapture noundef writeonly %A, ptr nocaptur
 ; CHECK:         IR   %indvars.iv.next = add nsw i64 %indvars.iv, -1
 ; CHECK-NEXT:  No successors
 ; CHECK-NEXT:  }
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Interleaving disabled by the pass manager
-; CHECK-NEXT:  LV: Loop does not require scalar epilogue
-; CHECK-NEXT:  LV: Vectorizing: innermost loop.
+; CHECK:  LV: Loop does not require scalar epilogue
 ;
 entry:
   %cmp7 = icmp sgt i32 %n, 0