RFR: 8296472: Remove a JVMTI ObjectLocker

[Coleen Phillimore]

This patch moves the acquisition of the boot class loader lock out of the JVM and into the Java function.
Tested with tier1-4, and jvmti and jdi tests locally.

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Commit messages:
 - 8296472: Remove a JVMTI ObjectLocker

Changes: https://git.openjdk.org/jdk/pull/11023/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11023&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296472
  Stats: 6 lines in 2 files changed: 1 ins; 2 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/11023.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11023/head:pull/11023

PR: https://git.openjdk.org/jdk/pull/11023