RFR: 8372802: PrintFlagsFinal should also print locked flags [v3]

[Frederic Thevenet]

> This change aims to provide a way to print all flags including "locked" ones (e.g. Diagnostic and Experimental) without having to explicitly set `+UnlockExperimentalVMOptions` or `+UnlockDiagnosticVMOptions` 
> 
> This applies to the following VM options: `PrintFlagsFinal` , `PrintFlagsRanges`, `PrintFlagsInitial`, `PrintFlagsWithComments`, `-XprintFlags`, as well as the `PrintVMFlagsDCmd` diagnostic command (when set to show all flags).
> 
> Places that print out only flags that have been changed (i.e. that skip flags with default values), like when during the generation of hs_err reports, are not affected by this.

Frederic Thevenet has updated the pull request incrementally with one additional commit since the last revision:

  Reworked the test

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/28579/files
  - new: https://git.openjdk.org/jdk/pull/28579/files/6cdac8e1..3d22c0a2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28579&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28579&range=01-02

  Stats: 42 lines in 1 file changed: 16 ins; 20 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/28579.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28579/head:pull/28579

PR: https://git.openjdk.org/jdk/pull/28579