[PATCH] Port LSan to ARM Linux

[Maxim Ostapenko]

Hi all,

This patch provides initial LSan support for ARM Linux (TLS is not yet 
supported).

Compiler-rt doesn't support cross-compilation, so we just ran numerous 
(for about 10) LSan tests manually on target board.
All tests have successfully passed (all leaks were detected and 
backtraces were correct).

Tested on arm-linux-gnueabi.

Does the patch make sense?

-Maxim
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