Reland r21346 "Inobject slack tracking is done on a per-closure basis instead of per-shared info basis."
This fixes inobject slack tracking for prototype inheritance pattern that uses closures.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/290993009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21442 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Allow specifying base offset when constructing Keyed hydrogen instructions.

Port r21426 (17e6338)

This is preparation for pending hydrogen stub work that needs to access memory using KeyedLoad/KeyedStore operations where the base offset used for the accesses are is the the default (e.g. the size of an FixedArray header for FixedArrays or zero for external arrays).

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/296983003

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21443 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "Reland r21346 "Inobject slack tracking is done on a per-closure basis instead of per-shared info basis.""

This reverts r21442.

TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/292433016

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21444 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Customized support for feedback on calls to Array.

Port r21429 (a88ba79)

Original commit message:
Gather transition feedback on array calls, and inline the Array
function call when it makes sense.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/293063012

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00