fix a warning


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26941 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 68189e7..e7ce462 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2216,14 +2216,15 @@
           // Use unpcklpd
           return DAG.getNode(X86ISD::UNPCKLP, VT, V1, V1);
         // Leave the VECTOR_SHUFFLE alone. It matches SHUFP*.
-        break;
+        return SDOperand();
       } else if (VT == MVT::v4f32 && X86::isPSHUFDMask(PermMask.Val))
         // Leave the VECTOR_SHUFFLE alone. It matches PSHUFD.
-        break;
+        return SDOperand();
     }
 
     // TODO.
-    assert(0);
+    assert(0 && "TODO");
+    abort();
   }
   }
 }