[jdk17u] RFR: 8272703: StressSeed should be set via FLAG_SET_ERGO

[Aleksey Shipilev]

On Mon, 4 Oct 2021 14:46:59 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Clean backport to improve compiler testing.
> 
> Additional testing: 
>  - [x] Eyeballing `StressSeed` is printed in `hs_err` after the artificial crash

Got the push approval as well.

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PR: https://git.openjdk.java.net/jdk17u/pull/149