RFR: JDK-8293997: Unify os::current_thread_cpu_time_info and os::thread_cpu_time_info

Mon Sep 19 11:17:28 UTC 2022

The 2 methods os::current_thread_cpu_time_info and os::thread_cpu_time_info could be unified across the posix platforms.

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Commit messages:
 - JDK-8293997

Changes: https://git.openjdk.org/jdk/pull/10335/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10335&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293997
  Stats: 63 lines in 4 files changed: 17 ins; 46 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/10335.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10335/head:pull/10335

PR: https://git.openjdk.org/jdk/pull/10335