[llvm-commits] tsan: detect use-after-free

[Dmitry Vyukov]

ThreadSanitizer:
The patch adds new 'freed' bit to shadow. That idea is that if the bit is
set, any access will race with it. So it does not slow-down memory access
processing and allows to restore both tid/stack for free.

http://codereview.appspot.com/6214052
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