Test specpoline in recent Intel processors under Linux
Use make run_spec to execute a store in the speculative path of the specpoline.
Use make run_arch to execute a store in the architectural path of the specpoline.
The store is fixed as the first location (index 0) of a Flush+Reload buffer.
The program shows the timing1 of each of the 256 entries of the Flush+Reload buffer.
1 WARNING: The timing is in CORE CYCLES not TSC (wallclock) cycles but the difference should still be noticeable.