malloc: Trim unused arenas on thread exit

[Florian Weimer]

On 11/15/2017 12:19 PM, Siddhesh Poyarekar wrote:
> On Wednesday 15 November 2017 04:14 PM, Florian Weimer wrote:
>> It could be related to the ordering between tcache_thread_freeres and
>> arena_thread_freeres.  We should merge the two to enforce the correct
>> ordering.
> 
> I agree, it sounds like a better idea to have a single freeres for a
> module anyway.

Here's a patch which does just that.  Tested with and without 
--disable-experimental-malloc.

It doesn't have any consolidation/trimming changes.

Thanks,
Florian
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