[PATCH] Custom wrappers for DFSanitizing sprintf & snprintf

[Lorenzo Martignoni]

Hi pcc,

Introduce custom wrappers for sprintf & snprintf to propagate the labels of the arguments to the output string.

http://reviews.llvm.org/D5561

Files:
  lib/dfsan/dfsan_custom.cc
  lib/dfsan/done_abilist.txt
  lib/sanitizer_common/scripts/check_lint.sh
  test/dfsan/custom.c
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