guard for AIX only

Author: abhina-sree

llvm/test/TableGen/lit.local.cfg

@@ -1,8 +1,10 @@
+import platform
 import lit.formats
 
 config.suffixes = [".td"]
 config.excludes = ["Common", "Inputs"]
 
 # AIX 'diff' command doesn't support --strip-trailing-cr, but the internal
 # python implementation does, so use that for cross platform compatibility
-config.test_format = lit.formats.ShTest()
+if platform.system() == "AIX":
+    config.test_format = lit.formats.ShTest()