Fixes the MSVC build.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@159992 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Tooling/auto-detect-from-source-parent.cpp b/test/Tooling/auto-detect-from-source-parent.cpp
index cb5fd56..ea7eb15 100644
--- a/test/Tooling/auto-detect-from-source-parent.cpp
+++ b/test/Tooling/auto-detect-from-source-parent.cpp
@@ -6,3 +6,5 @@
 
 // CHECK: C++ requires
 invalid;
+
+// REQUIRES: shell