fix warning


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5107 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86CodeEmitter.cpp b/lib/Target/X86/X86CodeEmitter.cpp
index 38d1be6..dc9f4c0 100644
--- a/lib/Target/X86/X86CodeEmitter.cpp
+++ b/lib/Target/X86/X86CodeEmitter.cpp
@@ -213,6 +213,7 @@
   case X86II::Arg80:  return 10;
   case X86II::Arg128: return 16;
   default: assert(0 && "Memory size not set!");
+    return 0;
   }
 }