Mark as fall through.

llvm-svn: 75652
diff --git a/llvm/lib/Target/MSIL/MSILWriter.cpp b/llvm/lib/Target/MSIL/MSILWriter.cpp
index 1c2ea2f..b1239a2 100644
--- a/llvm/lib/Target/MSIL/MSILWriter.cpp
+++ b/llvm/lib/Target/MSIL/MSILWriter.cpp
@@ -682,6 +682,7 @@
       Tmp = "conv."+getTypePostfix(SrcTy,false,true);
       printSimpleInstruction(Tmp.c_str());
     }
+    // FALLTHROUGH
   case Instruction::SIToFP:
   case Instruction::FPToSI:
     Tmp = "conv."+getTypePostfix(Ty,false,true);