Remove special handling of fields in combination with elements transitions in Crankshaft.

Remove special handling of fields in combination with elements transitions in Crankshaft.

Instead first try to keep ICs monomorphic if elements kinds generalize. If that fails, use standard polymorphic handling. The Try*PolymorphicAsMonomorphic methods will automatically produce code similar to the previous approach using CheckMapsWithTransitions.

BUG=
R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15982

[Toon Verwaest, 2013-07-29 18:03:31]

PTAL

[Toon Verwaest, 2013-07-30 09:40:27]

Reassigning to hpayer.

[Hannes Payer (out of office), 2013-07-31 09:30:25]

LGTM

[Toon Verwaest, 2013-07-31 10:08:13]

Committed patchset #1 manually as r15982 (presubmit successful).