RFR: 8333871: Check sysinfo return values [v5]

[Matthias Baesken]

> In the review of [JDK-8333522](https://bugs.openjdk.org/browse/JDK-8333522) it has been discussed that we might run into issues because of failing sysinfo.
> However we miss checking the return values at some places, this might need adjustment.

Matthias Baesken has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge master
 - Merge remote-tracking branch 'origin/master' into JDK-8333871
 - use more asserts
 - 0 - terminate not needed
 - JDK-8333871

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Changes: https://git.openjdk.org/jdk/pull/28317/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28317&range=04
  Stats: 15 lines in 2 files changed: 8 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/28317.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28317/head:pull/28317

PR: https://git.openjdk.org/jdk/pull/28317