Fix compile error "jump to case label crosses initialization".
What compiler are people using that accepts this code?

llvm-svn: 33603
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 0dce6fd..69ca2c1 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -1542,11 +1542,12 @@
       default: assert(0 && "Unhandled argument type!");
       case MVT::i8:
       case MVT::i16:
-      case MVT::i32:
-       unsigned RegToUse = GPRArgRegs[ObjectVT-MVT::i8][GPRInd][NumIntRegs];
-       Reg = AddLiveIn(MF, RegToUse, GPRClasses[ObjectVT-MVT::i8]);
-       ArgValue = DAG.getCopyFromReg(Root, Reg, ObjectVT);
-       break;
+      case MVT::i32: {
+        unsigned RegToUse = GPRArgRegs[ObjectVT-MVT::i8][GPRInd][NumIntRegs];
+        Reg = AddLiveIn(MF, RegToUse, GPRClasses[ObjectVT-MVT::i8]);
+        ArgValue = DAG.getCopyFromReg(Root, Reg, ObjectVT);
+        break;
+      }
       case MVT::v16i8:
       case MVT::v8i16:
       case MVT::v4i32: