[jdk17u-dev] RFR: 8321931: memory_swap_current_in_bytes reports 0 as "unlimited"

[Goetz Lindenmaier]

I backport this for parity with 17.0.16-oracle.

-------------

Commit messages:
 - Backport 7777eb5e15b9f08cdc621c84ff38c72334388b56

Changes: https://git.openjdk.org/jdk17u-dev/pull/3423/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3423&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8321931
  Stats: 98 lines in 2 files changed: 97 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3423.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3423/head:pull/3423

PR: https://git.openjdk.org/jdk17u-dev/pull/3423