[patch] support LTO of transactional memory

[Aldy Hernandez]

> It's a consequence of a combination of the way that "weak" works on
> Darwin, and the fact that I tried to make a "one size fits all" crt.
>
>>
>> Can you try this?
>> <curr.txt>
>
> we will need a dummy for _ITM_deregisterTMCloneTable as well.

Then try this; similarly for any other symbols Darwin may be generating.

Feel free to commit as obvious, or just let me know if it works and I 
can commit.
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