新特性：
Add the arena..reset mallctl, which makes it possible to discard all of an arena's allocations in a single operation. ( @jasone)
Add the stats.retained and stats.arenas..retained statistics. ( @jasone)
Add the --with-version configure option. ( @jasone)
Support --with-lg-page values larger than actual page size. ( @jasone)
优化：
Use pairing heaps rather than red-black trees for various hot data structures. ( @djwatson, @jasone)
Streamline fast paths of rtree operations. ( @jasone)
Optimize the fast paths of calloc() and [m,d,sd]allocx(). ( @jasone)
Decommit unused virtual memory if the OS does not overcommit. ( @jasone)
Specify MAP_NORESERVE on Linux if [heuristic] overcommit is active, in order to avoid unfortunate interactions during fork(2). ( @jasone)
Bug 修复:
Fix chunk accounting related to triggering gdump profiles. ( @jasone)
Link against librt for clock_gettime(2) if glibc < 2.17. ( @jasone)
Scale leak report summary according to sampling probability. ( @jasone)
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