[jdk17u-dev] RFR: 8296796: Provide clean, platform-agnostic interface to C-heap trimming

[Aleksey Shipilev]

A little unclean backport to provide the basis for subsequent backport:
 8293114: JVM should trim the native heap

The uncleanliness comes from `#include` blocks and copyright lines updates.

Additional testing: 
 - [ ] Trim native unit tests
 - [ ] Linux AArch64 fastdebug `tier1`
 - [ ] Linux AArch64 fastdebug `tier2`
 - [ ] Linux AArch64 fastdebug `tier3`

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Commit messages:
 - Backport 0845b39caf6f04dca9cb7a5852f05b4b5ffbc034

Changes: https://git.openjdk.org/jdk17u-dev/pull/1615/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1615&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296796
  Stats: 141 lines in 10 files changed: 89 ins; 33 del; 19 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1615.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1615/head:pull/1615

PR: https://git.openjdk.org/jdk17u-dev/pull/1615