diff --git a/llvm/include/llvm/Transforms/IPO/LowerTypeTests.h b/llvm/include/llvm/Transforms/IPO/LowerTypeTests.h
--- a/llvm/include/llvm/Transforms/IPO/LowerTypeTests.h
+++ b/llvm/include/llvm/Transforms/IPO/LowerTypeTests.h
@@ -198,10 +198,14 @@
 } // end namespace lowertypetests
 
 class LowerTypeTestsPass : public PassInfoMixin<LowerTypeTestsPass> {
+  bool UseCommandLine = false;
+
+  ModuleSummaryIndex *ExportSummary = nullptr;
+  const ModuleSummaryIndex *ImportSummary = nullptr;
+  bool DropTypeTests = true;
+
 public:
-  ModuleSummaryIndex *ExportSummary;
-  const ModuleSummaryIndex *ImportSummary;
-  bool DropTypeTests;
+  LowerTypeTestsPass() : UseCommandLine(true) {}
   LowerTypeTestsPass(ModuleSummaryIndex *ExportSummary,
                      const ModuleSummaryIndex *ImportSummary,
                      bool DropTypeTests = false)
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
--- a/llvm/lib/Passes/PassRegistry.def
+++ b/llvm/lib/Passes/PassRegistry.def
@@ -67,7 +67,7 @@
 MODULE_PASS("invalidate<all>", InvalidateAllAnalysesPass())
 MODULE_PASS("ipsccp", IPSCCPPass())
 MODULE_PASS("print-ir-similarity", IRSimilarityAnalysisPrinterPass(dbgs()))
-MODULE_PASS("lowertypetests", LowerTypeTestsPass(nullptr, nullptr))
+MODULE_PASS("lowertypetests", LowerTypeTestsPass())
 MODULE_PASS("mergefunc", MergeFunctionsPass())
 MODULE_PASS("name-anon-globals", NameAnonGlobalPass())
 MODULE_PASS("no-op-module", NoOpModulePass())
diff --git a/llvm/lib/Transforms/IPO/LowerTypeTests.cpp b/llvm/lib/Transforms/IPO/LowerTypeTests.cpp
--- a/llvm/lib/Transforms/IPO/LowerTypeTests.cpp
+++ b/llvm/lib/Transforms/IPO/LowerTypeTests.cpp
@@ -2239,9 +2239,13 @@
 
 PreservedAnalyses LowerTypeTestsPass::run(Module &M,
                                           ModuleAnalysisManager &AM) {
-  bool Changed =
-      LowerTypeTestsModule(M, ExportSummary, ImportSummary, DropTypeTests)
-          .lower();
+  bool Changed;
+  if (UseCommandLine)
+    Changed = LowerTypeTestsModule::runForTesting(M);
+  else
+    Changed =
+        LowerTypeTestsModule(M, ExportSummary, ImportSummary, DropTypeTests)
+            .lower();
   if (!Changed)
     return PreservedAnalyses::all();
   return PreservedAnalyses::none();
diff --git a/llvm/test/Transforms/LowerTypeTests/simple.ll b/llvm/test/Transforms/LowerTypeTests/simple.ll
--- a/llvm/test/Transforms/LowerTypeTests/simple.ll
+++ b/llvm/test/Transforms/LowerTypeTests/simple.ll
@@ -1,3 +1,4 @@
+; RUN: opt -S -passes=lowertypetests < %s | FileCheck %s
 ; RUN: opt -S -lowertypetests < %s | FileCheck %s
 ; RUN: opt -S -lowertypetests -mtriple=x86_64-apple-macosx10.8.0 < %s | FileCheck %s
 ; RUN: opt -S -O3 < %s | FileCheck -check-prefix=CHECK-NODISCARD %s