add vrange-anon benchmark

This patch adds ebizzy benchmark and jemalloc allocator for measuring
vrange performance.

Jemalloc patch was wrote by Jason Evans who is creator of jemalloc.
Jason, Thanks!

How to use

1) ./setup-vrange-anon.sh
2) ./run-ebizzy.sh -p 1 -t 20 -v
   or
3) ./run-ebizzy.sh -p 1 -t 20

You can tune the number of process and thread.

Signed-off-by: Minchan Kim <minchan@kernel.org>