[PATCH v3] malloc: Fix list_lock/arena lock deadlock [BZ #19182]

[Florian Weimer]

The attached patch is another attempt at fixing bug 19182.

It splits free_list_lock from list_lock, making the relationship between
the locks clearer.  As a result, only one reordering is needed to avoid
deadlocks.

(free_list_lock can be replaced with atomics and removed completely in a
future cleanup.)

Florian
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