Kevin Conaway 7f4efa5358 Add support for reading AnonHugePages from /proc/meminfo
This commit adds support for reading the `AnonHugePages` field from `/proc/meminfo`.

The values in this field allow monitoring the [THP](https://www.kernel.org/doc/Documentation/vm/transhuge.txt) usage by systems that use this type of memory
..
proc Add support for reading AnonHugePages from /proc/meminfo