MIPS: Zonify types in compiler frontend

Port r18719 (13303b7a)

Original commit message:
Clean up some zone/isolate handling in AST and its visitors on the way.

(Based on https://codereview.chromium.org/103743004/)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/143873005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18726 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
ResetAllAllocationSitesDependentCode is not changing dependent code, assert removed.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/138163014

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18727 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Disable concurrent sweeping, pending investigation of failures.

TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/141653013

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18728 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "Add hydrogen support for ArrayPop, and remove the handwritten call stubs."

This reverts commit r18709, due to deopt fuzzer issue.
TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/143983010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18731 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Prepare push to trunk.  Now working on version 3.24.22.

R=jkummerow@chromium.org
TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/144023007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18732 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fixed floor-of-div optimization.

We removed an HDiv by hand which was still used by an HChange. The
solution is letting dead code removal do the cleanup.

Removed a fragile "optimization" (looking through an HChange), too,
this obviously never triggered and is hard to get right given all our
global invariants and state/type/... changes.

The repro is a bit tricky, because you need inlining to make our
representations and types disagree in this case.

LOG=y
BUG=334708
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/143903016

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18737 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove globale pretenuring mode from runtime.

BUG=
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/132003002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18738 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
ES6: Implement Object.setPrototypeOf

This reverts commit bdc89ae76c15f3ef2626f8849744500248aec3ba.

This is a revert of the revert with test/webkit updated as needed.

Original CL Description:

http://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.setprototypeof

This just exposes the internal %SetPrototype and adds all the required
type checks as specified.

BUG=v8:2675
LOG=Y
R=dslomov@chromium.org, rossberg@chromium.org

Review URL: https://codereview.chromium.org/144193005

Patch from Erik Arvidsson <arv@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18739 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Refactor fast path for empty constant strings in BinaryOp.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/143003005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18742 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Increase the number of allocations in OptimizedPretenuringdoubleArrayLiterals test to make sure that pretenuring decisions are not flaky on the tests bots.

BUG=

Review URL: https://codereview.chromium.org/129783006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18746 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'