Set optimizable to false on code object if shared function info says so....

Set optimizable to false on code object if shared function info says so.

Because we might throw away code when doing code flushing we need to
set the optimizable flag to false in CompileLaze if this has been set
on the shared function info. This is the only place where this can
happen, since we always exchange the code with the laze compile stub
when doing code flushing.

The comment in AbortAndDisable actually states that this is already
the case (and that comment should now be ok). 

Committed: http://code.google.com/p/v8/source/detail?r=7378

[Kasper Lund, 2011-03-14 12:57:43]

LGTM. Is there anyway to assert that we don't have code for a function that is
optimizable when shared->optimization_disabled() is true?