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

[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.

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Commit messages:
 - Move runWith() from VirtualThread to BaseVirtualThread.

Changes: https://git.openjdk.org/jdk/pull/14399/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14399&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8308609
  Stats: 25 lines in 4 files changed: 14 ins; 9 del; 2 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