Fix warning from r332654 with LLVM_ATTRIBUTE_USED

r332654 tried to fix an unused function warning with
a void cast. This approach worked for clang and gcc 
but not for MSVC. This commit replaces the void cast
with the LLVM_ATTRIBUTE_USED approach.

llvm-svn: 332910

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
index f8e8f759f83..59a11f23baf 100644
--- a/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
+++ b/llvm/lib/Transforms/Vectorize/VPlanVerifier.cpp
@@ -26,7 +26,8 @@ static cl::opt<bool> EnableHCFGVerifier("vplan-verify-hcfg", cl::init(false),
 
 /// Utility function that checks whether \p VPBlockVec has duplicate
 /// VPBlockBases.
-static bool hasDuplicates(const SmallVectorImpl<VPBlockBase *> &VPBlockVec) {
+LLVM_ATTRIBUTE_USED static bool
+hasDuplicates(const SmallVectorImpl<VPBlockBase *> &VPBlockVec) {
   SmallDenseSet<const VPBlockBase *, 8> VPBlockSet;
   for (const auto *Block : VPBlockVec) {
     if (VPBlockSet.count(Block))
@@ -52,7 +53,6 @@ static void verifyBlocksInRegion(const VPRegionBlock *Region) {
     // TODO: This won't work for switch statements.
     assert(!hasDuplicates(Successors) &&
            "Multiple instances of the same successor.");
-    (void)hasDuplicates;
 
     for (const VPBlockBase *Succ : Successors) {
       // There must be a bi-directional link between block and successor.