Add a --stats option to the client
Summary: Not all stats are worth logging for every user. Things like the initial heap
size are pretty deterministic if you know the input (i.e. the files being
checked). In fact, it's *only* useful information if you know the input. This
flag enables us to collect these types of stats: Things that would be useful
for a benchmark script to know, so it can say "for these inputs, under these
conditions, here's how hh_server behaves".
Reviewed By: @dabek
Differential Revision:
D2369302