Intrinsify named constructors on private classes.

Intrinsify named constructors on private classes.

This was broken before my GrowableArray change as well for the
_Double.fromInteger constructor.

This is using the fact that named constructors are the only method
names that contain '.'. Therefore, it is enough to check that the
classes match and that the method name starting at the '.' matches.

R=srdjan@google.com,iposva@google.com,fschneider@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=12958

[Mads Ager (google), 2012-09-27 13:36:59]

TBR to fix performance.

I'll keep an eye on everything. Performance and buildbots.