[PATCH] [libcxx] Use pseudo-terminal in LIT tests so color output from compiler error messages is captured.

[Eric Fiselier]

Hi mclow.lists, danalbert, jroelofs, ddunbar,

Change LibcxxTestFormat's execute_command method so it uses a pseudo-terminal when invoking the compiler commands. This means that clang will output color diagnostics and LIT will capture these diagnostics.

http://reviews.llvm.org/D6010

Files:
  test/lit.cfg
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