[PATCH] [libcxx] Add compiler utility class for LIT tests

[Eric Fiselier]

Hi danalbert, jroelofs,

This adds a compiler utility class that handles generating compile commands and running them. Instead of having to pass the compiler path and 3 groups of flags between the configuration and the test format this allows us to just pass the compiler object.

http://reviews.llvm.org/D7019

Files:
  test/libcxx/test/compiler.py
  test/libcxx/test/config.py
  test/libcxx/test/format.py

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