lv_postorder bug (fails to clear temporary flags)

Hi,

Milan discovered that running _lv_postorder twice in a row fails to work properly, due to uncleared postorder flags. This patch should fix the problem.

Yours,
Petr

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id' Ash = Ash; id' Dust = Dust; id' _ = undefined

ack,

my code now works as expected with this patch.

Milan