[VPlan] Replace LLVM_ATTRIBUTE_USED with ifndef NDEBUG

Minor replacement. LLVM_ATTRIBUTE_USED was introduced to silence
a warning but using #ifndef NDEBUG makes more sense in this case.

Reviewers: dblaikie, fhahn, hsaito

Reviewed By: dblaikie

Differential Revision: https://reviews.llvm.org/D47498

llvm-svn: 333476

1 files changed, 3 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
index 83c7d236bf7..35100b83a32 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
@@ -24,10 +24,10 @@ static cl::opt<bool> EnableHCFGVerifier("vplan-verify-hcfg", cl::init(false),
                                         cl::Hidden,
                                         cl::desc("Verify VPlan H-CFG."));
 
+#ifndef NDEBUG
 /// Utility function that checks whether \p VPBlockVec has duplicate
 /// VPBlockBases.
-LLVM_ATTRIBUTE_USED static bool
-hasDuplicates(const SmallVectorImpl<VPBlockBase *> &VPBlockVec) {
+static bool hasDuplicates(const SmallVectorImpl<VPBlockBase *> &VPBlockVec) {
   SmallDenseSet<const VPBlockBase *, 8> VPBlockSet;
   for (const auto *Block : VPBlockVec) {
     if (VPBlockSet.count(Block))
@@ -36,6 +36,7 @@ hasDuplicates(const SmallVectorImpl<VPBlockBase *> &VPBlockVec) {
   }
   return false;
 }
+#endif
 
 /// Helper function that verifies the CFG invariants of the VPBlockBases within
 /// \p Region. Checks in this function are generic for VPBlockBases. They are