[LegacyPM] Remove GCOVProfilerLegacyPass

Using the legacy PM for the optimization pipeline was deprecated in 13.0.0.
Following recent changes to remove non-core features of the legacy
PM/optimization pipeline, remove GCOVProfilerLegacyPass.

I have checked many LLVM users and only llvm-hs[1] uses the legacy gcov pass.

[1]: https://github.com/llvm-hs/llvm-hs/issues/392

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D123829

llvm/include/llvm/InitializePasses.h

@@ -172,7 +172,6 @@ void initializeFunctionImportLegacyPassPass(PassRegistry&);
 void initializeFunctionSpecializationLegacyPassPass(PassRegistry &);
 void initializeGCMachineCodeAnalysisPass(PassRegistry&);
 void initializeGCModuleInfoPass(PassRegistry&);
-void initializeGCOVProfilerLegacyPassPass(PassRegistry&);
 void initializeGVNHoistLegacyPassPass(PassRegistry&);
 void initializeGVNLegacyPassPass(PassRegistry&);
 void initializeGVNSinkLegacyPassPass(PassRegistry&);

llvm/include/llvm/LinkAllPasses.h

@@ -102,7 +102,6 @@ namespace {
       (void) llvm::createDomPrinterPass();
       (void) llvm::createDomOnlyViewerPass();
       (void) llvm::createDomViewerPass();
-      (void) llvm::createGCOVProfilerPass();
       (void) llvm::createInstrProfilingLegacyPass();
       (void) llvm::createFunctionImportPass();
       (void) llvm::createFunctionInliningPass();

llvm/include/llvm/Transforms/Instrumentation.h

@@ -75,9 +75,6 @@ struct GCOVOptions {
   std::string Exclude;
 };
 
-ModulePass *createGCOVProfilerPass(const GCOVOptions &Options =
-                                   GCOVOptions::getDefault());
-
 ModulePass *createCGProfileLegacyPass();
 
 // The pgo-specific indirect call promotion function declared below is used by

llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp

@@ -165,39 +165,6 @@ private:
   StringMap<bool> InstrumentedFiles;
 };
 
-class GCOVProfilerLegacyPass : public ModulePass {
-public:
-  static char ID;
-  GCOVProfilerLegacyPass()
-      : GCOVProfilerLegacyPass(GCOVOptions::getDefault()) {}
-  GCOVProfilerLegacyPass(const GCOVOptions &Opts)
-      : ModulePass(ID), Profiler(Opts) {
-    initializeGCOVProfilerLegacyPassPass(*PassRegistry::getPassRegistry());
-  }
-  StringRef getPassName() const override { return "GCOV Profiler"; }
-
-  bool runOnModule(Module &M) override {
-    auto GetBFI = [this](Function &F) {
-      return &this->getAnalysis<BlockFrequencyInfoWrapperPass>(F).getBFI();
-    };
-    auto GetBPI = [this](Function &F) {
-      return &this->getAnalysis<BranchProbabilityInfoWrapperPass>(F).getBPI();
-    };
-    auto GetTLI = [this](Function &F) -> const TargetLibraryInfo & {
-      return this->getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
-    };
-    return Profiler.runOnModule(M, GetBFI, GetBPI, GetTLI);
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<BlockFrequencyInfoWrapperPass>();
-    AU.addRequired<TargetLibraryInfoWrapperPass>();
-  }
-
-private:
-  GCOVProfiler Profiler;
-};
-
 struct BBInfo {
   BBInfo *Group;
   uint32_t Index;
@@ -233,21 +200,6 @@ struct Edge {
 };
 }
 
-char GCOVProfilerLegacyPass::ID = 0;
-INITIALIZE_PASS_BEGIN(
-    GCOVProfilerLegacyPass, "insert-gcov-profiling",
-    "Insert instrumentation for GCOV profiling", false, false)
-INITIALIZE_PASS_DEPENDENCY(BlockFrequencyInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
-INITIALIZE_PASS_END(
-    GCOVProfilerLegacyPass, "insert-gcov-profiling",
-    "Insert instrumentation for GCOV profiling", false, false)
-
-ModulePass *llvm::createGCOVProfilerPass(const GCOVOptions &Options) {
-  return new GCOVProfilerLegacyPass(Options);
-}
-
 static StringRef getFunctionName(const DISubprogram *SP) {
   if (!SP->getLinkageName().empty())
     return SP->getLinkageName();

llvm/lib/Transforms/Instrumentation/Instrumentation.cpp

@@ -97,7 +97,6 @@ void llvm::initializeInstrumentation(PassRegistry &Registry) {
   initializeModuleMemProfilerLegacyPassPass(Registry);
   initializeBoundsCheckingLegacyPassPass(Registry);
   initializeControlHeightReductionLegacyPassPass(Registry);
-  initializeGCOVProfilerLegacyPassPass(Registry);
   initializeCGProfileLegacyPassPass(Registry);
   initializeInstrOrderFileLegacyPassPass(Registry);
   initializeInstrProfilingLegacyPassPass(Registry);