[PATCH] Change the way labels are propagated when comparing memory through libc functions

[Lorenzo Martignoni]

  I realized that we could use the flags passed through 'DFSAN_OPTIONS' to allow the user to pick the preferred behaviour.

Hi pcc,

http://llvm-reviews.chandlerc.com/D2252

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2252?vs=5733&id=5825#toc

Files:
  lib/dfsan/dfsan.cc
  lib/dfsan/dfsan.h
  lib/dfsan/dfsan_custom.cc
  lib/dfsan/done_abilist.txt
  lib/dfsan/lit_tests/custom.c
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