Verify generic slices.SortFunc #533
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This PR adds the proof for the generic
SortFuncin theslicespackage of the Go standard library. The implementation is based on the pattern-defeating quicksort algorithm.The function
breakPatternsCmpFunc, which just randomly swaps and shuffles elements within a slice interval, is axiomatized; the functionLenfrom themath/bitspackage is also left unproved and is axiomatized to return an arbitraryw64value. All other components are fully verified.