Index: llvm/lib/LTO/LTOCodeGenerator.cpp
===================================================================
--- llvm/lib/LTO/LTOCodeGenerator.cpp
+++ llvm/lib/LTO/LTOCodeGenerator.cpp
@@ -117,6 +117,9 @@
     "lto-stats-file",
     cl::desc("Save statistics to the specified file"),
     cl::Hidden);
+static cl::opt<bool>
+    DebugPassManager("debug-pass-manager", cl::init(false), cl::Hidden,
+                     cl::desc("Print pass management debugging information"));
 }
 
 LTOCodeGenerator::LTOCodeGenerator(LLVMContext &Context)
@@ -130,6 +133,7 @@
   Config.PreCodeGenPassesHook = [](legacy::PassManager &PM) {
     PM.add(createObjCARCContractPass());
   };
+  Config.DebugPassManager = DebugPassManager;
 }
 
 LTOCodeGenerator::~LTOCodeGenerator() {}