Reenable optimized build


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7788 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
index 57ed27a..f87cddf 100644
--- a/lib/Support/Debug.cpp
+++ b/lib/Support/Debug.cpp
@@ -49,5 +49,9 @@
 // with the -debug-only=X option.
 //
 bool isCurrentDebugType(const char *DebugType) {
+#ifndef NDEBUG
   return CurrentDebugType.empty() || DebugType == CurrentDebugType;
+#else
+  return false;
+#endif
 }