[2.22] Backport malloc fixes from BZ#19048 and BZ#19243

[Paul E. Murphy]

On 04/13/2016 06:49 AM, Florian Weimer wrote:
> On 04/12/2016 11:53 PM, Paul E. Murphy wrote:
>> This attempts to backport BZ#19048, and the related fix in BZ#19243.
>>
>> The TLS refactoring made backporting 19048 a little more than
>> trivial.  It did not raise errors after running make check for x86_64
>> and ppc64le.
>>
>> This should get a review before pushing.
> 
> NEWS has unrelated changes.
> 
> You should also backport commits 90c400bd4904b0240a148f0b357a5cbc36179239, 7962541a32eff5597bc4207e781cfac8d1bb0d87, and perhaps 2a38688932243b5b16fb12d84c7ac1138ce50363.

Thanks for pointing those out.  I've backported the above 3 as well, and fixed
NEWS (oops).

Is there any potential objection to pushing these onto the common 2.22 release
branch? Otherwise, I'll keep them on the ibm branch.
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