RFR: 8319875: Add macOS implementation for jcmd System.map [v17]

[Simon Tooke]

> This is a port of #16301  to macOS.
> 
> System.map and System.dump_map are implemented using the macOS API and provide roughly the same information in the same format. Most of the heavy lifting was implemented by @tstuefe in https://github.com/openjdk/jdk/pull/16301 - this PR adds the macOS implementation and enables the common code for macOS 64 bit.
> 
> The System.map tests are also reworked to be cleaner for the three implementations.
> 
> [sample output using G1GC](https://github.com/user-attachments/files/17558064/g1_map.txt)
> [sample output using ZGC](https://github.com/user-attachments/files/17558067/zgc_map.txt)

Simon Tooke has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 35 commits:

 - Merge branch 'openjdk:master' into pr_macos_system_dump
 - fix crash due to uninitilized pointer
 - whitespace error
 - changes from revue
 - add constant
 - fix whitespace
 - combine like 128MB regions
 - fix trailing whitesdpae errors
 - latest cleanup, get rid of dll info
 - change format strings to display all digits properly
 - ... and 25 more: https://git.openjdk.org/jdk/compare/a6277bb5...c5cb0f97

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Changes: https://git.openjdk.org/jdk/pull/20953/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20953&range=16
  Stats: 583 lines in 9 files changed: 505 ins; 40 del; 38 mod
  Patch: https://git.openjdk.org/jdk/pull/20953.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20953/head:pull/20953

PR: https://git.openjdk.org/jdk/pull/20953