[jdk25u] RFR: 8365165: Zap C-heap memory at delete/free

[Aleksey Shipilev]

Improves JDK reliability by capturing lifecycle problems early on.

Additional testing:
 - [x] Linux x86_64 server fastdebug, `all`

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Commit messages:
 - Backport ca753ebad6681a76d18800d23898b7d6af83f567

Changes: https://git.openjdk.org/jdk25u/pull/247/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=247&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8365165
  Stats: 12 lines in 3 files changed: 9 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u/pull/247.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/247/head:pull/247

PR: https://git.openjdk.org/jdk25u/pull/247