[PATCH][Review Requested][Compilation Time] Calculate hash value and equality comparison within SCEV node itself

[Anton Korobeynikov]

> PS: That said, you should really also include the number of runs, but hey!
And after this - build confidence bounds for means and test the
hypothesis that means are same / different :) Probably the best
possible comparison here.

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With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University