Mesh: compactifying replacement of malloc for CPUs

[sbastrakov]

There is a recent paper on compacting memory management for C++ applications. Importantly, it does not pose restrictions on manual handling of pointers and how the memory is used in general. The results look promising.

They have an open implementation. It is essentially a drop-in replacement for malloc with LD_PRELOAD. So could probably be used as a mallocMC backend.

[psychocoderHPC]

I tried libMesh with a blockchain daemon and it reduces the memory footprint by 20%.
Next test would be with PIConGPU.