[PATCH] call __asan_load_cxx_array_cookie when loading array cookie in asan mode.

[Kostya Serebryany]

Extend the comment and check that address space is 0 (otherwise asan doesn't want to handle the pointer)

PTAL

http://reviews.llvm.org/D5111

Files:
  lib/CodeGen/ItaniumCXXABI.cpp
  test/CodeGen/address-sanitizer-and-array-cookie.cpp
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