MIPS: Change LookupForWrite to always do a full lookup and check the result.

MIPS: Change LookupForWrite to always do a full lookup and check the result.

Port r14061 (df49702a)

Original commit message:
If we find a property in the prototype-chain that we can overwrite, and
we have a transition, keep the holder in the lookup-result as the actual
holder. We will need it for the consistency-check in GenerateStoreField.

By directly checking the entire chain we avoid having to lazily bail out
to a copy of the miss stub while generating the Field Store IC.

Currently this CL disallows a normal non-receiver holder, given that
that would require a positive lookup + details verification to ensure
the property did not become read-only. This fixes the regressions in the
attached tests.

BUG=

Committed: https://code.google.com/p/v8/source/detail?r=14070

[Toon Verwaest, 2013-03-25 17:05:54]

lgtm

[palfia, 2013-03-25 17:12:59]

Committed manually as r14070 (presubmit successful).