diff --git a/llvm/include/llvm/PassSupport.h b/llvm/include/llvm/PassSupport.h
--- a/llvm/include/llvm/PassSupport.h
+++ b/llvm/include/llvm/PassSupport.h
@@ -77,7 +77,19 @@
   INITIALIZE_PASS_BEGIN(PassName, Arg, Name, Cfg, Analysis)                    \
   PassName::registerOptions();
 
-template <typename PassName> Pass *callDefaultCtor() { return new PassName(); }
+template <class PassName,
+          typename std::enable_if<std::is_default_constructible<PassName>{},
+                                  bool>::type = true>
+Pass *callDefaultCtor() {
+  return new PassName();
+}
+
+template <class PassName,
+          typename std::enable_if<!std::is_default_constructible<PassName>{},
+                                  bool>::type = true>
+Pass *callDefaultCtor() {
+  return nullptr;
+}
 
 //===---------------------------------------------------------------------------
 /// RegisterPass<t> template - This template class is used to notify the system
diff --git a/llvm/lib/CodeGen/MachineCopyPropagation.cpp b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
--- a/llvm/lib/CodeGen/MachineCopyPropagation.cpp
+++ b/llvm/lib/CodeGen/MachineCopyPropagation.cpp
@@ -302,7 +302,7 @@
 public:
   static char ID; // Pass identification, replacement for typeid
 
-  MachineCopyPropagation(bool CopyInstr = false)
+  MachineCopyPropagation(bool CopyInstr)
       : MachineFunctionPass(ID), UseCopyInstr(CopyInstr || MCPUseCopyInstr) {
     initializeMachineCopyPropagationPass(*PassRegistry::getPassRegistry());
   }
@@ -1026,7 +1026,6 @@
   return Changed;
 }
 
-MachineFunctionPass *
-llvm::createMachineCopyPropagationPass(bool UseCopyInstr = false) {
+MachineFunctionPass *llvm::createMachineCopyPropagationPass(bool UseCopyInstr) {
   return new MachineCopyPropagation(UseCopyInstr);
 }
diff --git a/llvm/lib/CodeGen/RegAllocEvictionAdvisor.h b/llvm/lib/CodeGen/RegAllocEvictionAdvisor.h
--- a/llvm/lib/CodeGen/RegAllocEvictionAdvisor.h
+++ b/llvm/lib/CodeGen/RegAllocEvictionAdvisor.h
@@ -168,6 +168,8 @@
 public:
   enum class AdvisorMode : int { Default, Release, Development };
 
+  RegAllocEvictionAdvisorAnalysis() = delete;
+
   RegAllocEvictionAdvisorAnalysis(AdvisorMode Mode)
       : ImmutablePass(ID), Mode(Mode){};
   static char ID;
diff --git a/llvm/lib/CodeGen/RegAllocPriorityAdvisor.h b/llvm/lib/CodeGen/RegAllocPriorityAdvisor.h
--- a/llvm/lib/CodeGen/RegAllocPriorityAdvisor.h
+++ b/llvm/lib/CodeGen/RegAllocPriorityAdvisor.h
@@ -23,6 +23,7 @@
 /// live ranges.
 class RegAllocPriorityAdvisor {
 public:
+  RegAllocPriorityAdvisor() = delete;
   RegAllocPriorityAdvisor(const RegAllocPriorityAdvisor &) = delete;
   RegAllocPriorityAdvisor(RegAllocPriorityAdvisor &&) = delete;
   virtual ~RegAllocPriorityAdvisor() = default;
diff --git a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
--- a/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelDAGToDAG.cpp
@@ -46,9 +46,11 @@
 public:
   static char ID;
 
-  explicit AArch64DAGToDAGISel(AArch64TargetMachine *tm = nullptr,
-                               CodeGenOpt::Level OptLevel = CodeGenOpt::Default)
-      : SelectionDAGISel(ID, *tm, OptLevel), Subtarget(nullptr) {}
+  AArch64DAGToDAGISel() = delete;
+
+  explicit AArch64DAGToDAGISel(AArch64TargetMachine &tm,
+                               CodeGenOpt::Level OptLevel)
+      : SelectionDAGISel(ID, tm, OptLevel), Subtarget(nullptr) {}
 
   StringRef getPassName() const override { return PASS_NAME; }
 
@@ -5546,7 +5548,7 @@
 /// AArch64-specific DAG, ready for instruction scheduling.
 FunctionPass *llvm::createAArch64ISelDag(AArch64TargetMachine &TM,
                                          CodeGenOpt::Level OptLevel) {
-  return new AArch64DAGToDAGISel(&TM, OptLevel);
+  return new AArch64DAGToDAGISel(TM, OptLevel);
 }
 
 /// When \p PredVT is a scalable vector predicate in the form
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
--- a/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
@@ -93,8 +93,9 @@
 public:
   static char ID;
 
-  explicit AMDGPUDAGToDAGISel(TargetMachine *TM = nullptr,
-                              CodeGenOpt::Level OptLevel = CodeGenOpt::Default);
+  AMDGPUDAGToDAGISel() = delete;
+
+  explicit AMDGPUDAGToDAGISel(TargetMachine &TM, CodeGenOpt::Level OptLevel);
   ~AMDGPUDAGToDAGISel() override = default;
 
   void getAnalysisUsage(AnalysisUsage &AU) const override;
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -171,9 +171,10 @@
   public:
     static char ID;
 
-    explicit X86DAGToDAGISel(X86TargetMachine *tm = nullptr,
-                             CodeGenOpt::Level OptLevel = CodeGenOpt::Default)
-        : SelectionDAGISel(ID, *tm, OptLevel), Subtarget(nullptr),
+    X86DAGToDAGISel() = delete;
+
+    explicit X86DAGToDAGISel(X86TargetMachine &tm, CodeGenOpt::Level OptLevel)
+        : SelectionDAGISel(ID, tm, OptLevel), Subtarget(nullptr),
           OptForMinSize(false), IndirectTlsSegRefs(false) {}
 
     StringRef getPassName() const override { return PASS_NAME; }
@@ -6201,5 +6202,5 @@
 /// ready for instruction scheduling.
 FunctionPass *llvm::createX86ISelDag(X86TargetMachine &TM,
                                      CodeGenOpt::Level OptLevel) {
-  return new X86DAGToDAGISel(&TM, OptLevel);
+  return new X86DAGToDAGISel(TM, OptLevel);
 }