8014219: Make the run-octane harness more deterministic by not measuring elapsed time every iteration. Also got rid of most of the run logic in base.js and call benchmarks directly for the same purpose
Reviewed-by: jlaskey, attila
Compiled OK: box2d
Compiled OK: code-load
Compiled OK: crypto
Compiled OK: deltablue
Compiled OK: earley-boyer
Compiled OK: gbemu
Compiled OK: mandreel
Compiled OK: navier-stokes
Compiled OK: pdfjs
Compiled OK: raytrace
Compiled OK: regexp
Compiled OK: richards
Compiled OK: splay