Basic array capacity feedback via allocation sites.

Basic array capacity feedback via allocation sites.

Caveats:
 * Gathers feedback in full code, bakes in only in optimized code.
 * Only works for these cases:
     new Array();
     new Array(<0 <= constant <= 8>);
   and not for
     new Array(arg1, arg2, ..., argN)
   or
     new Array(non-constant length)

Also (as if that wasn't enough)
 * Only gathers feedback on calls to array.push on SMI or FAST arrays
   which are handled by the C++ runtime.

BUG=

[mvstanton, 2014-11-05 22:29:27]

mvstanton@chromium.org changed reviewers:
+ danno@chromium.org, hpayer@chromium.org, titzer@chromium.org

[mvstanton, 2014-11-05 22:29:27]

Hi guys,
Here is the experiment with array capacity feedback thus far. It works modulo a
few caveats :p.
--Michael

[mvstanton, 2014-11-05 23:11:52]

Patchset #2 (id:20001) has been deleted

[titzer, 2016-01-11 17:43:36]

titzer@chromium.org changed reviewers:
- titzer@chromium.org