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

[Lorenzo Martignoni]

  Removed the new custom wrappers.

  I think for now it could be convenient to experiment with both approaches.

Hi pcc,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2252?vs=5825&id=5869#toc

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