Properly initialize the extensionClassLoader from the VM snapshot

[ThanHenderson]

This patch properly initializes the extensionClassLoader on restore runs through the paths in BytecodeInterpreter.hpp and FastJNI_com_ibm_oti_vm_VM.cpp rather than, incorrectly, allocating a new class loader.

Fixes: #20861
Signed-off-by: Nathan Henderson [email protected]

[babsingh]

jenkins test sanity.functional amac jdk21

[ThanHenderson]

The PR build failure is an infra issue.

But all the tests passed from the "failing" build:

17:04:52  TOTAL: 111   EXECUTED: 111   PASSED: 111   FAILED: 0   DISABLED: 0   SKIPPED: 0
17:04:52  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
17:04:52  
17:04:52  ALL TESTS PASSED

[babsingh]

More details on the failure: Artifiactory was unreachable (infra issue).

17:05:02  Error occurred for request GET /artifactory/api/system/version HTTP/1.1: No route to host (Host unreachable).
17:05:02  Attempting retry #1
17:05:05  Error occurred for request GET /artifactory/api/system/version HTTP/1.1: No route to host (Host unreachable).
17:05:05  Attempting retry #2
17:05:08  Error occurred for request GET /artifactory/api/system/version HTTP/1.1: No route to host (Host unreachable).
17:05:08  Attempting retry #3
17:05:11  Error occurred for request GET /artifactory/api/system/version HTTP/1.1: No route to host (Host unreachable).

[babsingh]

All PR build tests passed. No functional test failures were seen.