RFR: 8352812: remove useless class and function parameter in SuspendThread impl

[Serguei Spitsyn]

The internal class JvmtiSuspendControl is transitively used in the SuspendThread implementation is not really needed and is being removed. Also, the suspend_thread function has unused need_safepoint_p parameter which is being removed as well.

Testing:
 - TBD: Run mach5 tiers 1-3 to be safe

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Commit messages:
 - 8352812: remove useless class and function parameter in SuspendThread impl

Changes: https://git.openjdk.org/jdk/pull/24219/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24219&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352812
  Stats: 68 lines in 5 files changed: 0 ins; 58 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/24219.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24219/head:pull/24219

PR: https://git.openjdk.org/jdk/pull/24219