Fix leak on div by zero compound assignment with coercion

The result == op1 check did not work properly here, because op1
was &op1_copy at this point. Move the division by zero reporting

Fix leak on div by zero compound assignment with coercion

The result == op1 check did not work properly here, because op1
was &op1_copy at this point. Move the division by zero reporting
out of the _base function, so it can check the original op1.

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