functional/JLM_Tests fail to compile with JDK_impl=hotspot

Spotted when running https://github.com/adoptium/aqa-tests/blob/master/.github/workflows/directoriesFilesChangePR.yml (which itself should be improved/removed based on https://github.com/adoptium/aqa-tests/issues/2299).

Example:
https://github.com/adoptium/aqa-tests/actions/runs/8335749724/job/22811786784?pr=5150

```
/Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:374: error: incompatible types: long[] cannot be converted to long
[javac] tb.getThreadCpuTime(badIds);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:400: error: incompatible types: long[] cannot be converted to long
[javac] long[] times = tb.getThreadCpuTime(ids);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:415: error: incompatible types: long[] cannot be converted to long
[javac] AssertJUnit.assertTrue(tb.getThreadCpuTime(new long[] {Thread.currentThread().getId()})[0] == -1);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:425: error: incompatible types: long[] cannot be converted to long
[javac] long[] tmp = tb.getThreadCpuTime(new long[] {100});
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:595: error: incompatible types: cannot be converted to long
[javac] tb.getThreadUserTime(null);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:602: error: incompatible types: long[] cannot be converted to long
[javac] tb.getThreadUserTime(badIds);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:628: error: incompatible types: long[] cannot be converted to long
[javac] long[] times = tb.getThreadUserTime(ids);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:643: error: incompatible types: long[] cannot be converted to long
[javac] AssertJUnit.assertTrue(tb.getThreadUserTime(new long[] {Thread.currentThread().getId()})[0] == -1);
[javac] ^
[javac] /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java:653: error: incompatible types: long[] cannot be converted to long
[javac] long[] tmp = tb.getThreadUserTime(new long[] {100});
[javac] ^
[javac] Note: /Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/src/j9vm/test/softmx/SoftmxRemoteTest.java uses or overrides a deprecated API.
[javac] Note: Recompile with -Xlint:deprecation for details.
[javac] Note: Some input files use unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.
[javac] Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
[javac] 10 errors

BUILD FAILED
/Users/runner/work/aqa-tests/aqa-tests/aqa-tests/TKG/scripts/build_test.xml:95: The following error occurred while executing this line:
/Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/build.xml:52: The following error occurred while executing this line:
/Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/build.xml:144: The following error occurred while executing this line:
/Users/runner/work/aqa-tests/aqa-tests/aqa-tests/functional/JLM_Tests/build.xml:61: Compile failed; see the compiler error output for details.

Total time: 38 seconds
1
make[1]: *** [compile] Error 1
make: *** [compile] Error 2
Error: The process '/usr/bin/make' failed with exit code 2
```

Likely has to be mitigated by an update in the openj9 repository, or TKG to skip compilation in certain case.

Start with functional/JLM_Tests/src/org/openj9/test/java/lang/management/TestThreadMXBean.java and reproduce the failure through the referenced workflow or JLM_Tests build.xml. Check the JDK_impl=hotspot compilation errors and the suggested OpenJ9 or TKG path. Done means JLM_Tests compiles successfully in that configuration.

Written by the indexing model from the issue text.