Change the Literal class's operator== to be bitwise (#1661)

The change means that nan values will be compared bitwise when writing A == B, and so the float rule of a nan is different from itself would not apply.

I think this is a safer default. In particular this PR fixes a fuzz bug in the rse pass, which placed Literals in a hash table, and due to nan != nan, an infinite loop... Also, looks like we really want a bitwise comparison pretty much everywhere anyhow, as can be seen in the diff here. Really the single place we need a floaty comparison is in the intepreter where we implement f32.eq etc., and there the code was already using the proper code path anyhow.

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