[jdk21u-dev] RFR: 8340969: jdk/jfr/startupargs/TestStartDuration.java should be marked as flagless

[SendaoYan]

On Sat, 7 Dec 2024 01:50:34 GMT, SendaoYan <syan at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [470701f0](https://github.com/openjdk/jdk/commit/470701f0bb269834cc0e1cb40f7d34e92226454b) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Leonid Mesnik on 6 Dec 2024 and was reviewed by SendaoYan and Erik Gahlin.
> 
> Thanks!

GHA report 1 test failures:

1. linux-x64/build job at `Get JTReg` stage fails as `wget exited with exit code 4`, seems like infra issue or environment issue, it's unrelated to this PR.

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PR Comment: https://git.openjdk.org/jdk21u-dev/pull/1208#issuecomment-2527174974