Add conversion rules for Float/Double negation #3520
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It seems that there are two rules missing which convert from javaUnaryMinusFloat/Double to negFloat/negDouble. Without these rules, KeY (and also the SMT float conversion) can not prove very much when a negation occurs, since the function will just be left uninterpreted.
This PR just adds the two missing rules.
Caveat: Somebody with more knowledge about floating points should double-check this PR (I think it should be sound but am not 100% sure).
Type of pull request
-[x] Bug fix (non-breaking change which fixes an issue)
-[x] There are changes to the taclet rule base
Ensuring quality
The contributions within this pull request are licensed under GPLv2 (only) for inclusion in KeY.