Missing variable META_CPU_HZ

[rajansawhney]

Missing variable META_CPU_HZ

Error detail:
For using derived metrics for AutoPerf (eg: autoperf/examples/derived) the autoperf.cfg uses FP_INEFFICIENT2 to evaluate the derived metrics

FP_INEFFICIENT2 contains:
((PAPI_FP_INS/PAPI_TOT_INS)(PAPI_RES_STL/PAPI_TOT_CYC))(PAPI_TOT_CYC/META_CPU_HZ)

Location of FP_INEFFICIENT2 = autoperf/autoperf/utils/metric_spec/
But META_CPU_HZ is unknown.

Steps to reproduce:

1. Go to autoperf/example/derived
2. make (to compile pi.c)
3. autoperf (run autoperf)
4. autoperf -y (-> error. META_CPU_HZ unknown)