Fix unused variable warning in LoopFusion pass

[kbarton]

Summary

Do not wrap the contents of printFusionCandidates in the LLVM_DEBUG macro. This fixes an unused variable warning generated when compiling without asserts but with -DENABLE_LLVM_DUMP.

[Meinersbur]

LGTM

llvm/lib/Transforms/Scalar/LoopFuse.cpp

326

[nit] Added double empty line (would be cleaned up by clang-format)

llvm/lib/Transforms/Scalar/LoopFuse.cpp

 inline llvm::raw_ostream &operator<<(llvm::raw_ostream &OS,
                                      const FusionCandidateSet &CandSet) {
   for (auto IT : CandSet)
     OS << IT << "\n";
 
   return OS;
 }
 
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+#if !defined(NDEBUG)
 static void
 printFusionCandidates(const FusionCandidateCollection &FusionCandidates) {
-  LLVM_DEBUG(dbgs() << "Fusion Candidates: \n");
+  dbgs() << "Fusion Candidates: \n";
   for (const auto &CandidateSet : FusionCandidates) {
-    LLVM_DEBUG({
       dbgs() << "*** Fusion Candidate Set ***\n";
       dbgs() << CandidateSet;
       dbgs() << "****************************\n";
-    });
   }
 }
 #endif
 
+
 /// Collect all loops in function at the same nest level, starting at the
 /// outermost level.
 ///
 /// This data structure collects all loops at the same nest level for a
 /// given function (specified by the LoopInfo object). It starts at the
 /// outermost level.
 struct LoopDepthTree {
   using LoopsOnLevelTy = SmallVector<LoopVector, 4>;