[PATCH] [msan] intercept dlopen and clear shadow for it

[Reid Kleckner]

    - move unpoison dso back to msan_linux.cc, use <elf.h>

Hi eugenis,

http://llvm-reviews.chandlerc.com/D509

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D509?vs=1249&id=1252#toc

Files:
  lib/msan/msan.cc
  lib/msan/msan.h
  lib/msan/msan_interceptors.cc
  lib/msan/msan_interface_internal.h
  lib/msan/msan_linux.cc
  lib/msan/tests/CMakeLists.txt
  lib/msan/tests/msan_loadable.cc
  lib/msan/tests/msan_test.cc
  lib/msandr/msandr.cc
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