RFR: 8308609: java/lang/ScopedValue/StressStackOverflow.java fails with "-XX:-VMContinuations" [v7]

[Andrew Haley]

> Move `runWith()` from `VirtualThread` to `BaseVirtualThread`.
> 
> `BoundVirtualThread` does not use `runWith()` to run its task, so when a VM error occurs it can not recover scoped values.
> 
> Moving `runWith()` into the common subclass of both `VirtualThread` and `BoundVirtualThread` fixes the problem.

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  Don't share ThreadLocalRandom instance, cleanup.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14399/files
  - new: https://git.openjdk.org/jdk/pull/14399/files/cded1566..b2663471

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14399&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14399&range=05-06

  Stats: 18 lines in 1 file changed: 0 ins; 7 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/14399.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14399/head:pull/14399

PR: https://git.openjdk.org/jdk/pull/14399