[PATCH] Sanitize printf functions

[Yury Gribov]

  Updates based on prev review.

  Missing stuff:
  * MSan still using old interceptors
  * no tests for TSan and MSan

  Plus a bunch of questions inlined (see TODO markers).

Hi samsonov, eugenis,

http://llvm-reviews.chandlerc.com/D2480

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2480?vs=6284&id=6286#toc

Files:
  msan/msan_interceptors.cc
  asan/lit_tests/TestCases/printf-2.c
  asan/lit_tests/TestCases/printf-4.c
  asan/lit_tests/TestCases/printf-1.c
  asan/lit_tests/TestCases/printf-3.c
  tsan/rtl/tsan_stat.h
  tsan/rtl/tsan_stat.cc
  sanitizer_common/sanitizer_common_interceptors.inc
  sanitizer_common/sanitizer_platform_interceptors.h
  sanitizer_common/sanitizer_flags.cc
  sanitizer_common/sanitizer_flags.h
  sanitizer_common/sanitizer_common_interceptors_scanf.inc
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