RFR: 8338428: Print final VM flags for task [v3]

[Leonid Mesnik]

> Some VM flags might depend on the environment and it makes sense to log final flags so it is possible to get their value when investigating failures.
> 
> I added them to VMProps, so it is always dump final flags before running tests using "-XX:+PrintFlagsFinal".
> 
> Update:
> There were intermittent compilation failures when I tried to use classes from testlibrary, so I rewrtite the code without them.

Leonid Mesnik has updated the pull request incrementally with three additional commits since the last revision:

 - seconnd attempt
 - Revert "updated VMProps"
   
   This reverts commit 6af3f1c6d72353ec5d40b9d1fde05771ef102141.
 - Revert "The test lib is not ued"
   
   This reverts commit 919c870e0475597f4128b663c3f303ae56d06e1c.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23054/files
  - new: https://git.openjdk.org/jdk/pull/23054/files/919c870e..d2f3b1c2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23054&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23054&range=01-02

  Stats: 37 lines in 3 files changed: 4 ins; 32 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23054.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23054/head:pull/23054

PR: https://git.openjdk.org/jdk/pull/23054