RFR: 8346717: serviceability/dcmd/vm/SystemDumpMapTest.java failing on Windows with "Stack base not yet set for thread id" [v4]

[Simon Tooke]

> This test fixes an issue with incomplete Windows threads not yet having a stack.  A test for a null stack_base is added to guard against the potential null dereference.  An additional test using ZGC is added to the jtreg SystemMapTest.

Simon Tooke has updated the pull request incrementally with one additional commit since the last revision:

  test SystemMap with and without ZGC

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/22870/files
  - new: https://git.openjdk.org/jdk/pull/22870/files/f47f9425..f62bbd7c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22870&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22870&range=02-03

  Stats: 11 lines in 1 file changed: 1 ins; 2 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/22870.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22870/head:pull/22870

PR: https://git.openjdk.org/jdk/pull/22870