Add a memory-hungry benchmark

[jvoisin]

I think that currently, we don't have any memory-hungy benchmark. It might be interesting to add one.

[alphanso]

You can compile llvm toolchain. I believe it's quite memory intensive. Also, it will be interesting to see a benchmark with and without hugepages.

[jvoisin]

Unfortunately, it's a bit overkill, since we're running the benchmark suite on github actions on a couple of platforms, for every commit.