NFC. Require DirectX backend for these tests

Should have added this when I added the test directory. This just
requires the DirectX target for running these tests.

diff --git a/llvm/test/Transforms/EarlyCSE/DirectX/lit.local.cfg b/llvm/test/Transforms/EarlyCSE/DirectX/lit.local.cfg
new file mode 100644 (file)
index 0000000..b5b9899
--- /dev/null
+++ b/llvm/test/Transforms/EarlyCSE/DirectX/lit.local.cfg
@@ -0,0 +1,4 @@
+config.suffixes = ['.ll']
+
+if not 'DirectX' in config.root.targets:
+    config.unsupported = True