[PowerPC] Add lit.local.cfg in AtomicExpand tests

Fixed build errors on other platforms.

diff --git a/llvm/test/Transforms/AtomicExpand/PowerPC/lit.local.cfg b/llvm/test/Transforms/AtomicExpand/PowerPC/lit.local.cfg
new file mode 100644 (file)
index 0000000..0913324
--- /dev/null
+++ b/llvm/test/Transforms/AtomicExpand/PowerPC/lit.local.cfg
@@ -0,0 +1,2 @@
+if not 'PowerPC' in config.root.targets:
+    config.unsupported = True