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* ISLE: split algebraic.isle into several files * delete `algebraic.clif` * Add `README.md` * Remove old `algebraic.clif` tests --------- Co-authored-by: Jamey Sharp <jsharp@fastly.com>
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Rules here are allowed to rewrite pure expressions arbitrarily,
using the same inputs as the original, or fewer. In other words, we
cannot pull a new eclass id out of thin air and refer to it, other
than a piece of the input or a new node that we construct; but we
can freely rewrite e.g. x+y-y to x.