Move GCTracer to separate files.

- No functional changes.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/416543003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22600 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert 22595: "Keep new arrays allocated with 'new Array(N)' in fast mode"

Due to failures in mjsunit/array-functions-prototype-misc

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/417953004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22601 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
For-of on null or undefined is an error

The latest ES6 draft changed the behavior of for-of on null / undefined,
which for once is a simplification.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/416033002

Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22602 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Stage for-of

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/417923004

Patch from Andy Wingo <wingo@igalia.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22603 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add a histogram timer around low memory notifications from API

BUG=397026
R=hpayer@chromium.org, ernstm@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/416853002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22604 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add event statistics to GCTracer.

- Add method to GCTracer to compute mean and max of the last few
  Scavenger, Mark Compactor and Incremental Marking events.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/410413005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22605 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'