[PATCH] [libcxxabi] Refactor test timing logic and disable by default.

[Eric Fiselier]

Somewhat address @jroelofs comments. The timers are enabled by default EXCEPT when using LIT. Since there is currently no way in LIT to show the output it doesn't make sense to introduce the `<chrono>` dependency.

http://reviews.llvm.org/D6391

Files:
  test/dynamic_cast14.cpp
  test/dynamic_cast3.cpp
  test/dynamic_cast5.cpp
  test/dynamic_cast_stress.cpp
  test/lit.cfg
  test/support/timer.hpp
  test/test_demangle.cpp
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