RFR: 8334026: Provide a diagnostic PrintMemoryMapAtExit switch on Linux [v2]

[Thomas Stuefe]

> To investigate footprint problems of processes with a short lifespan (e.g. startup footprint problems), we found it very useful to be able to get an annotated memory map at exit - the same map printed by jcmd System.map.

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/19660/files
  - new: https://git.openjdk.org/jdk/pull/19660/files/2b3a3f98..f03983b3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19660&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19660&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19660.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19660/head:pull/19660

PR: https://git.openjdk.org/jdk/pull/19660