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

[Aleksey Shipilev]

Clean backport to improve compiler testing.

Additional testing: 
 - [x] Eyeballing `StressSeed` is printed in `hs_err` after the artificial crash

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Commit messages:
 - Backport 66ce09f51eb37029c8ba67a70f8c90a307dae1eb

Changes: https://git.openjdk.java.net/jdk17u/pull/149/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=149&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272703
  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/149.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/149/head:pull/149

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