It is NDEBUG not _NDEBUG


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23186 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index b587e36..4121e40 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -36,7 +36,7 @@
 #include <iostream>
 using namespace llvm;
 
-#ifndef _NDEBUG
+#ifndef NDEBUG
 static cl::opt<bool>
 ViewDAGs("view-isel-dags", cl::Hidden,
          cl::desc("Pop up a window to show isel dags as they are selected"));