diff --git a/llvm/include/llvm/InitializePasses.h b/llvm/include/llvm/InitializePasses.h
--- a/llvm/include/llvm/InitializePasses.h
+++ b/llvm/include/llvm/InitializePasses.h
@@ -83,7 +83,6 @@
 void initializeCallGraphPrinterLegacyPassPass(PassRegistry&);
 void initializeCallGraphViewerPass(PassRegistry&);
 void initializeCallGraphWrapperPassPass(PassRegistry&);
-void initializeCallSiteSplittingLegacyPassPass(PassRegistry&);
 void initializeCheckDebugMachineModulePass(PassRegistry &);
 void initializeCodeGenPreparePass(PassRegistry&);
 void initializeComplexDeinterleavingLegacyPassPass(PassRegistry&);
diff --git a/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp b/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
--- a/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
+++ b/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
@@ -535,42 +535,6 @@
   return Changed;
 }
 
-namespace {
-struct CallSiteSplittingLegacyPass : public FunctionPass {
-  static char ID;
-  CallSiteSplittingLegacyPass() : FunctionPass(ID) {
-    initializeCallSiteSplittingLegacyPassPass(*PassRegistry::getPassRegistry());
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.addRequired<TargetLibraryInfoWrapperPass>();
-    AU.addRequired<TargetTransformInfoWrapperPass>();
-    AU.addRequired<DominatorTreeWrapperPass>();
-    AU.addPreserved<DominatorTreeWrapperPass>();
-    FunctionPass::getAnalysisUsage(AU);
-  }
-
-  bool runOnFunction(Function &F) override {
-    if (skipFunction(F))
-      return false;
-
-    auto &TLI = getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(F);
-    auto &TTI = getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
-    auto &DT = getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-    return doCallSiteSplitting(F, TLI, TTI, DT);
-  }
-};
-} // namespace
-
-char CallSiteSplittingLegacyPass::ID = 0;
-INITIALIZE_PASS_BEGIN(CallSiteSplittingLegacyPass, "callsite-splitting",
-                      "Call-site splitting", false, false)
-INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(TargetTransformInfoWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_END(CallSiteSplittingLegacyPass, "callsite-splitting",
-                    "Call-site splitting", false, false)
-
 PreservedAnalyses CallSiteSplittingPass::run(Function &F,
                                              FunctionAnalysisManager &AM) {
   auto &TLI = AM.getResult<TargetLibraryAnalysis>(F);
diff --git a/llvm/lib/Transforms/Scalar/Scalar.cpp b/llvm/lib/Transforms/Scalar/Scalar.cpp
--- a/llvm/lib/Transforms/Scalar/Scalar.cpp
+++ b/llvm/lib/Transforms/Scalar/Scalar.cpp
@@ -19,7 +19,6 @@
 /// initializeScalarOptsPasses - Initialize all passes linked into the
 /// ScalarOpts library.
 void llvm::initializeScalarOpts(PassRegistry &Registry) {
-  initializeCallSiteSplittingLegacyPassPass(Registry);
   initializeConstantHoistingLegacyPassPass(Registry);
   initializeDCELegacyPassPass(Registry);
   initializeScalarizerLegacyPassPass(Registry);