[jdk8u-dev] RFR: 8266391: Replace use of reflection in jdk.internal.platform.Metrics [v2]

[Jonathan Dowland]

> A clean backport of 8266391 for jdk8u-dev as part of cgroups v2 support.

Jonathan Dowland has updated the pull request incrementally with one additional commit since the last revision:

  Add a macosx platform specific SystemMetrics class

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Changes:
  - all: https://git.openjdk.org/jdk8u-dev/pull/177/files
  - new: https://git.openjdk.org/jdk8u-dev/pull/177/files/d458c605..86708c07

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=177&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=177&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/177.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/177/head:pull/177

PR: https://git.openjdk.org/jdk8u-dev/pull/177