commit ca06498ef3233fc78e7790f4d8d7190e1ea1c870
author Ryan Savitski <rsavitski@google.com> Tue Sep 24 16:51:13 2019 +0100
committer Ryan Savitski <rsavitski@google.com> Fri Sep 27 11:13:30 2019 +0000
tree 80ecfc294672841692b2addc87bff12e62b84648
parent f9291073cc2b24f1131578b51f33715b54f51ccc

android builds (incl. standalone): switch from Oz to O2

This speeds up ftrace parsing by about ~25% (12% little
core -> 9% little core) on a crosshatch under medium load.

In terms of binary size (android tree builds on master):

HEAD:
12K   bin/traced_probes
12K   bin/traced
600K  bin/perfetto
316K  bin/trigger_perfetto
940K  lib64/libperfetto.so
32K   lib64/libperfetto_android_internal.so

This topic:
12K   bin/traced_probes
12K   bin/traced
708K  bin/perfetto
364K  bin/trigger_perfetto
1.1M  lib64/libperfetto.so
28K   lib64/libperfetto_android_internal.so

On GetStaticEventInfo in particular:
* without the posted change, we're about +75K on libperfetto.so
  when switching to O2.

I've kept the return type as a vector since the proto translation
table ends up operating on a dynamic vector in the end. I've also
kept it separate from trace_processor's ftrace descriptor array,
since they are different enough that a shared definition ends up
being more convoluted.

"bloaty" diff on libperfetto.so (this topic (O2) vs head (Oz)):
  file size +165K
  vm size +203K
https://paste.googleplex.com/5528773631934464

Change-Id: I442d42914dcc7ab56a09f068cb86b2842c2c3297