Subzero: Print memory usage info when dumping.

Adds "-verbose mem" to enable printing the amount of CfgLocalAllocator memory allocated, each time Cfg::dump() is called.

"-verbose mem,status" is a good way to get summary info.

BUG= none
R=kschimpf@google.com

Review URL: https://codereview.chromium.org/1743043002 .
3 files changed