[jdk17u-dev] RFR: 8310233: Fix THP detection on Linux

Fri Aug 25 12:06:42 UTC 2023

*Note: not for October CPU*

Unclean backport. Needed as a prerequisite to fix [JDK-8312182](https://bugs.openjdk.org/browse/JDK-8312182).

No factual differences exist; merge failed due to surrounding hunks being different (NULL->nullptr).

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Commit messages:
 - Backport 37ca9024ef59d99cae0bd7e25b2e6d3c1e085f97

Changes: https://git.openjdk.org/jdk17u-dev/pull/1694/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1694&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310233
  Stats: 815 lines in 7 files changed: 684 ins; 99 del; 32 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1694.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1694/head:pull/1694

PR: https://git.openjdk.org/jdk17u-dev/pull/1694