[llvm] [GVN][PGO] Skip GVN if entry BlockFreq is 0 (PR #166336)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/GVN.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp
index 0dcc194ae..285b6b305 100644
--- a/llvm/lib/Transforms/Scalar/GVN.cpp
+++ b/llvm/lib/Transforms/Scalar/GVN.cpp
@@ -894,16 +894,17 @@ PreservedAnalyses GVNPass::run(Function &F, FunctionAnalysisManager &AM) {
     MSSA = &AM.getResult<MemorySSAAnalysis>(F);
   }
   auto &ORE = AM.getResult<OptimizationRemarkEmitterAnalysis>(F);
-  
+
   // Skip the pass if function has zero entry count in PGO.
-  // This indicates that the function is never executed according to the profile data.
+  // This indicates that the function is never executed according to the profile
+  // data.
   auto EntryCount = F.getEntryCount();
   if (EntryCount && EntryCount->getCount() == 0) {
     LLVM_DEBUG(dbgs() << "GVN: Skipping function '" << F.getName()
                       << "' with zero profile entry count\n");
     return PreservedAnalyses::all();
   }
-  
+
   bool Changed = runImpl(F, AC, DT, TLI, AA, MemDep, LI, &ORE,
                          MSSA ? &MSSA->getMSSA() : nullptr);
   if (!Changed)

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https://github.com/llvm/llvm-project/pull/166336