Add an assert to check for empty flags for MachineMemOperand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53680 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineInstr.cpp

@@ -246,6 +246,7 @@ MachineMemOperand::MachineMemOperand(const Value *v, unsigned int f,
   : Offset(o), Size(s), V(v),
     Flags((f & 7) | ((Log2_32(a) + 1) << 3)) {
   assert(isPowerOf2_32(a) && "Alignment is not a power of 2!");
+  assert((isLoad() || isStore()) && "Not a load/store!");
 }
 
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