RFR: 8293492: ShenandoahControlThread missing from hs-err log and thread dump

[Ashutosh Mehra]

Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>

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Commit messages:
 - 8293492: ShenandoahControlThread missing from hs-err log and thread dump

Changes: https://git.openjdk.org/jdk/pull/10205/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10205&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293492
  Stats: 18 lines in 3 files changed: 1 ins; 16 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10205.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10205/head:pull/10205

PR: https://git.openjdk.org/jdk/pull/10205