Fix semantics for subtypes #2
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The arithmetic semantics is missing a check when the rhs operand is of the same type or of a supertype of the lhs operand. This was pointed by Guido Van Rossum here: faster-cpython/ideas#626
This PR adds the missing checks. It required minimal updates to the partial evaluator, mainly to remove some dead code that was generated in the behaviors.
The behaviors were regenerated from the fixed semantics. Notice that they are identical to the previous ones.