Fix warning building in optimized mode


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13190 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bytecode/Reader/InstructionReader.cpp b/lib/Bytecode/Reader/InstructionReader.cpp
index d66b12c..5033a32 100644
--- a/lib/Bytecode/Reader/InstructionReader.cpp
+++ b/lib/Bytecode/Reader/InstructionReader.cpp
@@ -319,6 +319,7 @@
           IdxTy = Type::UIntTyID;
         else {
           switch (ValIdx & 3) {
+          default:
           case 0: IdxTy = Type::UIntTyID; break;
           case 1: IdxTy = Type::IntTyID; break;
           case 2: IdxTy = Type::ULongTyID; break;