Each Analysis_config.t specifies a regression run by Core_bench. This module also
provides several typical regressions that one might want to run.
nanos_vs_runs predicts nanos using runs. In this regression and all of the ones
below, no error estimate is computed.
cycles_vs_runs predicts cycles using runs.
allocations_vs_runs estimates minor allocations, major allocations and
promotoions in terms of runs and overhead.
allocations_vs_runs estimates minor collections, major collections and
compations in terms of runs.
A laundry list of several typical regressions: nanos_vs_runs,
allocations_vs_runs and gc_vs_runs.