[jdk17u-dev] RFR: 8300659: Refactor TestMemoryAwareness to use WhiteBox api for host values

[Martin Doerr]

Backport of [JDK-8300659](https://bugs.openjdk.org/browse/JDK-8300659).

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Commit messages:
 - Backport 3c61d5aa48606dab2d2c639d5f0a56313476917d

Changes: https://git.openjdk.org/jdk17u-dev/pull/1484/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1484&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300659
  Stats: 47 lines in 3 files changed: 27 ins; 1 del; 19 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1484.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1484/head:pull/1484

PR: https://git.openjdk.org/jdk17u-dev/pull/1484