[RFA] Adding n <= max_size check in allocator::allocate

[Paolo Carlini]

Paolo Carlini wrote:

> From a QoI point of view, at least, I think we should have these
> checks in our allocators (only pool_allocator is ok!) and mean to
> work on this ASAP, together with the corresponding testcases.

Hi again,

Just finished testing the below on x86/x86_64, 
--enable-libstdcxx-allocator=mt,
bitmap, new, pool.

I will commit it later today, barring objections...

Paolo.

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