This winds up exposing things in the nsIMemoryReporterManager interface
that arguably don't belong at that level of abstraction -- "minimize
memory usage first" and DMD -- in order to take advantage of the
infrastructure that GetReports already has for managing the child
processes.
This patch also adds "abbreviated gc log", which produces a not-all-traces CC log.
--HG--
extra : rebase_source : 84eed72c34b7cc8116fbe05258f5de22bf3275bc
