RFR: 8294271: make bootcycle-images fails after JDK-8289610

[Jie Fu]

Hi all,

Since `ThreadDeath` would be deprecated soon, I assume it's fine to just remove it.

Thanks.
Best regards,
Jie

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Commit messages:
 - 8294271: make bootcycle-images fails after JDK-8289610

Changes: https://git.openjdk.org/jdk/pull/10406/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10406&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8294271
  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10406.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10406/head:pull/10406

PR: https://git.openjdk.org/jdk/pull/10406