[PATCH] Sanitize printf functions

[Yury Gribov]

  New revision based on comments from glider, eugenis and kcc.

  Main changes:
  * fixed sanitizer_scanf_interceptor_test.cc
  * update printf path based on Open Group std
  * fixed several bugs based on glibc printf tests (manifested in segvs and false alarms)
  * check_printf is now false by default

Hi samsonov, eugenis,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2480?vs=6321&id=6394#toc

Files:
  lib/sanitizer_common/sanitizer_common_interceptors_scanf.inc
  lib/sanitizer_common/sanitizer_flags.cc
  lib/sanitizer_common/sanitizer_common_interceptors.inc
  lib/sanitizer_common/sanitizer_platform_interceptors.h
  lib/sanitizer_common/sanitizer_flags.h
  lib/sanitizer_common/tests/sanitizer_scanf_interceptor_test.cc
  lib/asan/lit_tests/TestCases/printf-1.c
  lib/asan/lit_tests/TestCases/printf-3.c
  lib/asan/lit_tests/TestCases/printf-5.c
  lib/asan/lit_tests/TestCases/printf-2.c
  lib/asan/lit_tests/TestCases/printf-4.c
  lib/tsan/lit_tests/printf-1.c
  lib/tsan/rtl/tsan_stat.h
  lib/tsan/rtl/tsan_stat.cc
  lib/msan/msan_interceptors.cc
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