[jdk17u-dev] RFR: 8343205: CompileBroker::possibly_add_compiler_threads excessively polls available memory

[Martin Doerr]

Backport of [JDK-8343205](https://bugs.openjdk.org/browse/JDK-8343205) from jdk21u-dev.

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Commit messages:
 - Backport 3087c6c74d742b7b5eaf28e4c886b5dc1811ea6f

Changes: https://git.openjdk.org/jdk17u-dev/pull/3106/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343205
  Stats: 29 lines in 2 files changed: 18 ins; 0 del; 11 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3106.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3106/head:pull/3106

PR: https://git.openjdk.org/jdk17u-dev/pull/3106