Rename _LIBCPP_DEBUG2 to _LIBCPP_DEBUG.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189140 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp b/test/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
index 4967679..3f1685c 100644
--- a/test/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
+++ b/test/containers/unord/unord.set/unord.set.cnstr/move.pass.cpp
@@ -179,7 +179,7 @@
         assert(c0.empty());
     }
 #endif
-#if _LIBCPP_DEBUG2 >= 1
+#if _LIBCPP_DEBUG >= 1
     {
         std::unordered_set<int> s1 = {1, 2, 3};
         std::unordered_set<int>::iterator i = s1.begin();