[PATCH] [libcxx] Teach libcxx's lit configuration new ways to find lit.site.cfg

[Eric Fiselier]

================
Comment at: test/lit.cfg:589
@@ +588,3 @@
+        lit_config.load_config(config, site_cfg)
+        raise SystemExit
+
----------------
EricWF wrote:
> danalbert wrote:
> > You're actually raising a class here, not an exception. This would catch on `except type as ex` rather than `except SystemExit as ex` :)
> Thanks! This needs to be fixed in Clang's `lit.cfg` as well.
Actually I think we are both wrong. `raise SystemExit` seems to be equivalent to `raise SystemExit()`. If any arguments are added then `lit.TestingConfig.load_from_path` will exit before running any of the tests. I'll add the braces for clarity.

https://github.com/llvm-mirror/llvm/blob/master/utils/lit/lit/TestingConfig.py#L99

http://reviews.llvm.org/D6255

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