Remove non-ASCII characters at the beginning of file.

It's not clear how these ended up in the file, but this fixes it.

llvm-svn: 347223
diff --git a/lldb/lit/helper/toolchain.py b/lldb/lit/helper/toolchain.py
index 183db60..7aa5d0e 100644
--- a/lldb/lit/helper/toolchain.py
+++ b/lldb/lit/helper/toolchain.py
@@ -1,4 +1,4 @@
-import os
+import os
 import platform
 import subprocess
 import sys