implement axes_scan's broadcast semantics via dce - #5540
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By using DCE instead of partial evaluation, we unblock JAX_REMAT3=1 and the deletion of general partial eval in JAX. (A JAX version skew issue: in the newest (unreleased) JAX, consts are just leading invars. So we don't switch on len(consts).)
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cgarciae
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By using DCE instead of partial evaluation, we unblock JAX_REMAT3=1 and the deletion of general partial eval in JAX.
Drive-by fix of a separate issue in how debug_info was being created (don't pass in_tree, pass args). That should improve some error messages.