[v3] default linux allocator

[Mark Mitchell]

Benjamin Kosnik wrote:

>Yo dudes... this switches this default allocator for linux to
>mt_allocator. I'd like to try this out on mainline, and then possibly
>move this to the gcc-3_4-branch after a review of gcc-testresults.
>  
>
You need to justify why you want to move this to the 3.4 branch, unless 
it is fixing a regression.

Thanks,

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Mark Mitchell
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