[Patch] libstdc++/31370

[Paolo Carlini]

Hi,

the below is what I have for this PR: basically I took the patch 
provided by Matthew and commonized the checks to a single _M_check_len. 
The same I could do for the primary template, a nice clean-up.

I was afraid the testcase could stress too much the memory management of 
some machines, but apparently I have no problems running it on various 
x86 and x86-64 linux machines and also a few non-linux machines. Thus I 
mean to add it too, for now.

Paolo.

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