Index: llvm/trunk/lib/CodeGen/MachineInstr.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/MachineInstr.cpp
+++ llvm/trunk/lib/CodeGen/MachineInstr.cpp
@@ -38,6 +38,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/type_traits.h"
 #include "llvm/Target/TargetInstrInfo.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetRegisterInfo.h"
@@ -757,7 +758,8 @@
   if (MRI)
     return MRI->moveOperands(Dst, Src, NumOps);
 
-  // MachineOperand is a trivially copyable type so we can just use memmove.
+  static_assert(isPodLike<MachineOperand>::value,
+                "must be trivially copyable to memmove");
   std::memmove(Dst, Src, NumOps * sizeof(MachineOperand));
 }