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from 3775d228a [sanitizer] Don't call task_for_pid(mach_task_self). NFC. new aa0393ed6 [hwasan] implement detection of double-free (invalid-free)

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Summary of changes: lib/hwasan/hwasan_allocator.cc | 13 ++++++- lib/hwasan/hwasan_report.cc | 71 ++++++++++++++++++++++++++----------- lib/hwasan/hwasan_report.h | 1 + test/hwasan/TestCases/double-free.c | 23 ++++++++++++ 4 files changed, 87 insertions(+), 21 deletions(-) create mode 100644 test/hwasan/TestCases/double-free.c