FYI: 3_4-branch mt_allocator synched with mainline

[Paolo Carlini]

Hi,

the below is the full ChangeLog. To my best knowledge, there are now
only two pending issues in this area

 1- Further improved alignment (from 4 -> 8 on 32-bit machines and from
    8 -> 16 on 64-bit machines)
 2- Static inizialization troubles mentioned by Brad Spencer.

Otherwise, the code seems in pretty good shape, a serious option for
mainline and 3_4 too.

Tested x86/x86-64, check/check-performance.

Paolo.

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