Raise assertion when MachineOperand has unexpected target flag.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134671 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/MipsMCInstLower.cpp b/lib/Target/Mips/MipsMCInstLower.cpp
index 73f4aa7..f5cc3aa 100644
--- a/lib/Target/Mips/MipsMCInstLower.cpp
+++ b/lib/Target/Mips/MipsMCInstLower.cpp
@@ -35,7 +35,8 @@
   int Offset = 0;
 
   switch(MO.getTargetFlags()) {
-  default:                  Kind = MipsMCSymbolRefExpr::VK_Mips_None; break;
+  default:                  assert(0 && "Invalid target flag!");
+  case MipsII::MO_NO_FLAG:  Kind = MipsMCSymbolRefExpr::VK_Mips_None; break;
   case MipsII::MO_GPREL:    Kind = MipsMCSymbolRefExpr::VK_Mips_GPREL; break;
   case MipsII::MO_GOT_CALL: Kind = MipsMCSymbolRefExpr::VK_Mips_GOT_CALL; break;
   case MipsII::MO_GOT:      Kind = MipsMCSymbolRefExpr::VK_Mips_GOT; break;