Clean up some temporary allocations.

Yay to ArrayMap, letting me get rid of a bunch of temporary
iterators in core code paths like updateOomAdj.  (Now I definitely
need an ArraySet to finish that up.)

Also clean up various other things that are doing unnecessary
allocations, clean up some debug output, make more of the debug
output respect package filtering.

Change-Id: Ib4979faf4de8c7912739bc0937c3fa9e7bfcde67