When HBranch sees Smi, it sees Smi.

R=mvstanton@chromium.org

Review URL: https://chromiumcodereview.appspot.com/17064006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15159 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Reland "Make more GCs in idle notification handler."

Fix performance regression on benchmarks by filtering out short idle
notifications.

R=hpayer@chromium.org
BUG=241815

Review URL: https://chromiumcodereview.appspot.com/17005005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15160 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Make MathFloorOfDiv optimization trigger more often

BUG=v8:2205
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/16973002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15161 ce2b1a6d-e550-0410-aec6-3dcde31c8c00