Basic conditional optimisations #4
Description
We can perform incredibly basic boolean expression optimisations on conditional expressions (e.g. removing things like NOT NOT). This should improve code size and performance for evaluating branch conditions.
There are also code generation time optimisations that can be made here, as Cranelift has support for combined operations such as bor_not which can represent a NOT X OR Y and band_not which can represent a NOT X AND Y.