Make LABEL a builtin opcode.

llvm-svn: 33537
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
index eeea70d..33227ad 100644
--- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAG.cpp
@@ -452,6 +452,7 @@
       assert(0 && "This target-independent node should have been selected!");
     case ISD::EntryToken: // fall thru
     case ISD::TokenFactor:
+    case ISD::LABEL:
       break;
     case ISD::CopyToReg: {
       unsigned InReg;