R1:c5d38c6e08f9

Provide more information about cache sizing in cache diagnostics

Summary: Ref T5501. This expands cache information a little more.

Test Plan: {F362975}

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T5501

Differential Revision: https://secure.phabricator.com/D12316