MIR Serialization: Serialize the 'killed' register machine operand flag.

llvm-svn: 241734
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index a1f20f5..e3b515b 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -218,6 +218,8 @@
       OS << (Op.isDef() ? "implicit-def " : "implicit ");
     if (Op.isDead())
       OS << "dead ";
+    if (Op.isKill())
+      OS << "killed ";
     printReg(Op.getReg(), OS, TRI);
     // TODO: Print sub register.
     break;