RFR(S): 8184271: Time related C1 intrinsics produce inconsistent results when floating around

[Tobias Hartmann]

Hi,

please review the following patch:
https://bugs.openjdk.java.net/browse/JDK-8184271
http://cr.openjdk.java.net/~thartmann/8184271/webrev.00/

The problem is that the C1 intrinsics for System.nanoTime(), System.currentTimeMillis() and JVM.counterTime() are not pinned and may produce inconsistent results when floating around (see tests). The solution is to not unpin them.

Thanks to Vladimir I. for the analysis!

Tested with JPRT and RBT (running).

Thanks,
Tobias