Combine similar leaks (those with identical stack traces) into a single
leak report, and sort the resulting leaks by total leak size across all
similar leaks and their references.
Bug: 27208635
Change-Id: Ia2bf2ccf3fcbc110d1c7ba60e3b77348d1c63d8d
Find leaks that have no references at all, or are only referenced by
other leaks in the same strongly connected component, and hide all
referenced leaks.
Bug: 27208635
Change-Id: Ifbfd14e24e2ba0f8af7c1b887e57f34362720f2d