Fix arena allocation counting.

Add the "CHA" allocation kind description. Move the
statistics to the heap to avoid excessively large frames
triggering errors with -Werror, -Wframe-larger-than=.

Test: m test-art-host
Test: m test-art-host with arena allocation counting.
Change-Id: I7947a3a17b4c1ed773742516b1f7ab9a58c92150
2 files changed