[PATCH] make asan work with 7fff8000 offset and prelink

[Kostya Serebryany]

  addressed Alexey's comments.

Hi samsonov,

http://llvm-reviews.chandlerc.com/D411

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D411?vs=995&id=997#toc

Files:
  lib/sanitizer_common/sanitizer_internal_defs.h
  lib/asan/asan_rtl.cc
  lib/asan/asan_internal.h
  lib/asan/asan_mapping.h
  lib/asan/lit_tests/Linux/asan_prelink_test.cc
  include/sanitizer/common_interface_defs.h
  include/sanitizer/asan_interface.h
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