RFR: 8218753: Obsolete nonproduct flag ProfilerCheckIntervals

[Claes Redestad]

Hi,

the non-product flag ProfilerCheckIntervals appears to be a remnant used
to verify some operational statistics of the removed flat profiler.

I propose removing it.

Webrev: http://cr.openjdk.java.net/~redestad/8218753/open.00/
Bug:    https://bugs.openjdk.java.net/browse/JDK-8218753

Testing: tier1

Thanks!

/Claes