RFR 8189208: Cleanup ancient argument processing code

[gerard ziemski]

Hi all,

Please review this fix, which:

#1 removes overriding of “UseLinuxPosixThreadCPUClocks” to different 
default values in older JDKs
#2 removes checks for “supports_thread_park_blocker” and all of the 
supporting code

Bug: https://bugs.openjdk.java.net/browse/JDK-8189208
Web rev: http://cr.openjdk.java.net/~gziemski/8189208_rev1
Tested with Mach5 tier1,2,3, another Mach5 tier1,2,3,4,5 in progress…


Cheers