[PATCH] [DFSan] New custom wrappers

[Lorenzo Martignoni]

Hi pcc,

- Added the following custom wrappers:
  - strstr
  - strrchr
  - memchr
  - nanosleep
  - socketpair
- Tweaked a couple of existing wrappers: if a wrapper returns a pointers derived from an input pointer, then return the label of the input pointer
- Sorted tests invocation

http://llvm-reviews.chandlerc.com/D2354

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