RFR: 8364106: Include java.runtime.version in thread dump output [v3]

[David Holmes]

> Proposed output (similar to that produced for hs_err log):
> 
> 
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (26-internal-2025-07-28-0739549.daholme... mixed mode, sharing)
>                  JRE version: Java(TM) SE Runtime Environment (26.0) (fastdebug build 26-internal-2025-07-28-0739549.daholme...)
> 
> Threads class SMR info:
> ... 
> 
> Testing:
>  - manual thread dump production via ctrl-\
>  -  tiers 1-3 (sanity)
> 
> Potentially the null checks are not needed in this case as we should not be able to generate a thread dump until after things are initialized, but it doesn't really hurt.
> 
> Thanks

David Holmes has updated the pull request incrementally with one additional commit since the last revision:

  Add basic testing

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/26520/files
  - new: https://git.openjdk.org/jdk/pull/26520/files/ec593bb0..b3a37a0d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26520&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26520&range=01-02

  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26520.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26520/head:pull/26520

PR: https://git.openjdk.org/jdk/pull/26520