Removing LookupTransition from LookupRealNamedProperty and related utility functions.

Removing LookupTransition from LookupRealNamedProperty and related utility functions.

Callsites now have to manually lookup transitions if required. This
avoids unnecessary overhead of looking up transitions when we don't need
them. This also allows us to use IsFound() in many places where
IsProperty() was required previously.

Committed: https://code.google.com/p/v8/source/detail?r=12098

[Toon Verwaest, 2012-07-16 14:34:54]

PTAL. The main change is line 2357 in src/objects.cc; requiring some manual
additions of LookupTransition, and allowing the use of IsFound() rather than
IsProperty().

[Jakob Kummerow, 2012-07-16 14:45:04]

lgtm