[Scalar] Remove RewriteStatepointsForGCLegacyPass

llvm/include/llvm/InitializePasses.h

 void initializeRegionOnlyViewerPass(PassRegistry&);
 void initializeRegionPrinterPass(PassRegistry&);
 void initializeRegionViewerPass(PassRegistry&);
 void initializeRegisterCoalescerPass(PassRegistry&);
 void initializeRemoveRedundantDebugValuesPass(PassRegistry&);
 void initializeRenameIndependentSubregsPass(PassRegistry&);
 void initializeReplaceWithVeclibLegacyPass(PassRegistry &);
 void initializeResetMachineFunctionPass(PassRegistry&);
-void initializeRewriteStatepointsForGCLegacyPassPass(PassRegistry &);
 void initializeRewriteSymbolsLegacyPassPass(PassRegistry&);
 void initializeSCEVAAWrapperPassPass(PassRegistry&);
 void initializeSROALegacyPassPass(PassRegistry&);
 void initializeSafeStackLegacyPassPass(PassRegistry&);
 void initializeSafepointIRVerifierPass(PassRegistry&);
 void initializeSelectOptimizePass(PassRegistry &);
 void initializeScalarEvolutionWrapperPassPass(PassRegistry&);
 void initializeScalarizeMaskedMemIntrinLegacyPassPass(PassRegistry &);

llvm/include/llvm/Transforms/Scalar.h

 // does not generate explicit relocation sequences - that's handled by
 // RewriteStatepointsForGC which can be run at an arbitrary point in the pass
 // order following this pass.
 //
 FunctionPass *createPlaceSafepointsPass();
 
 //===----------------------------------------------------------------------===//
 //
-// RewriteStatepointsForGC - Rewrite any gc.statepoints which do not yet have
-// explicit relocations to include explicit relocations.
-//
-ModulePass *createRewriteStatepointsForGCLegacyPass();
-
-//===----------------------------------------------------------------------===//
-//
 // NaryReassociate - Simplify n-ary operations by reassociation.
 //
 FunctionPass *createNaryReassociatePass();
 
 //===----------------------------------------------------------------------===//
 //
 // LoopDataPrefetch - Perform data prefetching in loops.
 //

llvm/lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

PreservedAnalyses RewriteStatepointsForGC::run(Module &M,
   PreservedAnalyses PA;
   PA.preserve<TargetIRAnalysis>();
   PA.preserve<TargetLibraryAnalysis>();
   return PA;
 }
 
 namespace {
 
-class RewriteStatepointsForGCLegacyPass : public ModulePass {
-  RewriteStatepointsForGC Impl;
-
-public:
-  static char ID; // Pass identification, replacement for typeid
-
-  RewriteStatepointsForGCLegacyPass() : ModulePass(ID), Impl() {
-    initializeRewriteStatepointsForGCLegacyPassPass(
-        *PassRegistry::getPassRegistry());
-  }
-
-  bool runOnModule(Module &M) override {
-    bool Changed = false;
-    for (Function &F : M) {
-      // Nothing to do for declarations.
-      if (F.isDeclaration() || F.empty())
-        continue;
-
-      // Policy choice says not to rewrite - the most common reason is that
-      // we're compiling code without a GCStrategy.
-      if (!shouldRewriteStatepointsIn(F))
-        continue;
-
-      TargetTransformInfo &TTI =
-          getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
-      const TargetLibraryInfo &TLI =
-          getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
-      auto &DT = getAnalysis<DominatorTreeWrapperPass>(F).getDomTree();
-
-      Changed |= Impl.runOnFunction(F, DT, TTI, TLI);
-    }
-
-    if (!Changed)
-      return false;
-
-    // stripNonValidData asserts that shouldRewriteStatepointsIn
-    // returns true for at least one function in the module.  Since at least
-    // one function changed, we know that the precondition is satisfied.
-    stripNonValidData(M);
-    return true;
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    // We add and rewrite a bunch of instructions, but don't really do much
-    // else.  We could in theory preserve a lot more analyses here.
-    AU.addRequired<DominatorTreeWrapperPass>();
-    AU.addRequired<TargetTransformInfoWrapperPass>();
-    AU.addRequired<TargetLibraryInfoWrapperPass>();
-  }
-};
-
-} // end anonymous namespace
-
-char RewriteStatepointsForGCLegacyPass::ID = 0;
-
-ModulePass *llvm::createRewriteStatepointsForGCLegacyPass() {
-  return new RewriteStatepointsForGCLegacyPass();
-}
-
-INITIALIZE_PASS_BEGIN(RewriteStatepointsForGCLegacyPass,
-                      "rewrite-statepoints-for-gc",
-                      "Make relocations explicit at statepoints", false, false)
-INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
-INITIALIZE_PASS_END(RewriteStatepointsForGCLegacyPass,
-                    "rewrite-statepoints-for-gc",
-                    "Make relocations explicit at statepoints", false, false)
-
-namespace {
-
 struct GCPtrLivenessData {
   /// Values defined in this block.
   MapVector<BasicBlock *, SetVector<Value *>> KillSet;
 
   /// Values used in this block (and thus live); does not included values
   /// killed within this block.
   MapVector<BasicBlock *, SetVector<Value *>> LiveSet;
 

llvm/lib/Transforms/Scalar/Scalar.cpp

void llvm::initializeScalarOpts(PassRegistry &Registry) {
   initializeLowerWidenableConditionLegacyPassPass(Registry);
   initializeMergeICmpsLegacyPassPass(Registry);
   initializeMergedLoadStoreMotionLegacyPassPass(Registry);
   initializeNaryReassociateLegacyPassPass(Registry);
   initializePartiallyInlineLibCallsLegacyPassPass(Registry);
   initializeReassociateLegacyPassPass(Registry);
   initializeRedundantDbgInstEliminationPass(Registry);
   initializeRegToMemLegacyPass(Registry);
-  initializeRewriteStatepointsForGCLegacyPassPass(Registry);
   initializeScalarizeMaskedMemIntrinLegacyPassPass(Registry);
   initializeSROALegacyPassPass(Registry);
   initializeCFGSimplifyPassPass(Registry);
   initializeStructurizeCFGLegacyPassPass(Registry);
   initializeSimpleLoopUnswitchLegacyPassPass(Registry);
   initializeSinkingLegacyPassPass(Registry);
   initializeTailCallElimPass(Registry);
   initializeTLSVariableHoistLegacyPassPass(Registry);
   initializeSeparateConstOffsetFromGEPLegacyPassPass(Registry);
   initializeSpeculativeExecutionLegacyPassPass(Registry);
   initializeStraightLineStrengthReduceLegacyPassPass(Registry);
   initializePlaceBackedgeSafepointsLegacyPassPass(Registry);
   initializePlaceSafepointsLegacyPassPass(Registry);
   initializeLoopSimplifyCFGLegacyPassPass(Registry);
 }