[trans-mem] Do not instrument thread locals

[Patrick Marlier]

Hi,

I found that all thread local variables are instrumented with _ITM_W/R* 
calls whereas they should not be shared with other threads. This patch 
takes care of thread locals into requires_barrier and also adds the 
local save/restore for them. This patch also includes a testcase.

I did not fill any PR since I have already a patch for it but tell me if 
I have to.

Tested on x86_64-unknown-linux-gnu, ok for trunk?
Thanks.
--
Patrick Marlier.

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