Use table to dispatch debug commands.

R=ulan@chromium.org

Review URL: https://codereview.chromium.org/289473005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21325 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Only allow allocation site lifetime transitions from undicided to tenure or don't tenure.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/289973002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21326 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Decrease OldSurvivalRateLowThreshold to fit heap growing strategy.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/282223005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21327 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Run tests sorted by expected runtime.

BUG=
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/273613005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21328 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Refactor MacroAssembler::Prologue.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/288213002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21329 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'