(0.51) Implement JVM_GetProperties for jdk17+ #21349
Merged
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This reverts commit f12ef36, which re-instates commit 9620a5a, PR #21200 plus some additional cosmetic changes, and the following.
Setting SystemProps.customTmpdir is unnecessary, and fails. It already has the correct value from calling
SystemProps.initProperties().
Issue #21311
Modify the tracepoint used by test to match VM changes. cmdLineTester_PageAlignDirectMemory uses the j9jcl.352 tracepoint, which has moved to j9vm.791.
Issue #21314
Update JVM_GetTemporaryDirectory
Fixes #21294
Related to #21189
Cherry pick #21320