hg: jdk/jdk: 8242504: Enhance the system clock to nanosecond precision

[david.holmes at oracle.com]

Changeset: f1f88e6fad02
Author:    dholmes
Date:      2020-05-28 22:34 -0400
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/f1f88e6fad02

8242504: Enhance the system clock to nanosecond precision
Reviewed-by: dfuchs, rriggs, dcubed, vtewari
Contributed-by: Mark Kralj-Taylor <kralj.mark at gmail.com>, David Holmes <david.holmes at oracle.com>

! src/hotspot/os/linux/os_linux.cpp
! src/hotspot/os/posix/os_posix.cpp
! src/hotspot/os/posix/os_posix.hpp
! src/hotspot/os/posix/os_posix.inline.hpp
! test/jdk/java/time/test/java/time/TestClock_System.java
+ test/micro/org/openjdk/bench/java/lang/SystemTime.java
- test/micro/org/openjdk/bench/java/lang/Systems.java