Comment #1 on issue 2774 by [email protected]: CountOperation and
CompoundAssignment provide type feedback for observed maps, breaking
crankshaft.
http://code.google.com/p/v8/issues/detail?id=2774
I (obviously) wrote the test above just for o.x++ or o.x += 5; not both at
the same time.
The solution for the problem is, imho, to either not have
CompoundAssignment / CountOperation ICs at all; just like for stores, or to
filter out those maps in the typefeedback oracle. Crankshaft should never
see those maps.
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