[MIRParser] Parse lane masks for register live-ins

Differential Revision: https://reviews.llvm.org/D25530

llvm-svn: 284052
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index 11d84d7..884defb 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -499,7 +499,7 @@
       First = false;
       printReg(LI.PhysReg, OS, TRI);
       if (LI.LaneMask != ~0u)
-        OS << ':' << PrintLaneMask(LI.LaneMask);
+        OS << ":0x" << PrintLaneMask(LI.LaneMask);
     }
     OS << "\n";
     HasLineAttributes = true;