RFR: 8296472: Remove ObjectLocker around appendToClassPathForInstrumentation call [v2]

[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.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Revert ClassLoaders.java change

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11023/files
  - new: https://git.openjdk.org/jdk/pull/11023/files/0c0e1654..781b44fc

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11023&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11023&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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