[14] RFR(XS): 8229158: make UseSwitchProfiling non-experimental or false by-default

[Christian Hagedorn]

Hi

Please review the following enhancement:
https://bugs.openjdk.java.net/browse/JDK-8229158
http://cr.openjdk.java.net/~thartmann/8229158/webrev.00/

This just changes the flag UseSwitchProfiling from experimental to 
diagnostic.

Thanks!

Best regards,
Christian