[PATCH] [Zorg] Modify LIT flags for LibCXXBuilder.py

[Eric Fiselier]

Hi ddunbar, gribozavr, gkistanova,

I would like to add the `--show-xfail` and `--show-unsupported` flags to LIT within the LibCXXBuilder.
The extra output helps us keep track of the expected failures / unsupported tests without having to look through the entire log.

http://reviews.llvm.org/D5083

Files:
  zorg/buildbot/builders/LibCXXBuilder.py
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