it2-bootstrap: eval/operate glitch

[Aleksey Shipilev]

Hi,

I'm migrating some of my code to fit it2-bootstrap API, and I think the
method names are inconsistent:

       BinaryOperator.operate
        UnaryOperator.operate
    IntBinaryOperator.eval
     IntUnaryOperator.operate
 DoubleBinaryOperator.eval
  DoubleUnaryOperator.operate
   LongBinaryOperator.eval
    LongUnaryOperator.operate

Should we settle on "operate"?

-Aleksey.