[PATCH] [sanitizer] Introduce VerboseReport and use it in sanitizer code.

[Kostya Serebryany]

  What's the motivation?
  While this change makes the code more compact (good) it also changes the behavior  *slightly*
  (e.g. we now call GetCurrentTidOrInvalid unconditionally)

http://llvm-reviews.chandlerc.com/D2316