RFR: JDK-8325496: Make TrimNativeHeapInterval a product switch [v2]

[Thomas Stuefe]

> [JDK-8293114](https://bugs.openjdk.org/browse/JDK-8293114) introduced automatic C-heap trimming, for now supported only by the glibc. It is controlled by the command line switch `TrimNativeHeapInterval`. The feature has proven very valuable to customers, and all issues have been ironed out. So, I'd like to make this switch a non-experimental product switch.

Thomas Stuefe has updated the pull request incrementally with one additional commit since the last revision:

  Feedback David

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17799/files
  - new: https://git.openjdk.org/jdk/pull/17799/files/65ae8b19..15e4527c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17799&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17799&range=00-01

  Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17799.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17799/head:pull/17799

PR: https://git.openjdk.org/jdk/pull/17799