[PATCH] Add support of multiple test compilers and architecture for LLDB cmake builder

[Ying Chen]

Address several nits based on feedback.

Add comments for TODO task - check listed archs are compatible with host
Correct typos in comment message
Return function early if no test arch or compiler specified


http://reviews.llvm.org/D8335

Files:
  buildbot/osuosl/master/config/builders.py
  zorg/buildbot/builders/LLDBBuilder.py

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