jdk_jfr tests fail on jdk8 hotspot xLinux

The following tests from jdk_jfr in the extended openjdk test suite fail on xLinux

https://ci.adoptopenjdk.net/job/Test_openjdk8_hs_extended.openjdk_x86-64_linux_testList_1/30/testReport/

`jdk/jfr/event/compiler/TestCompilerCompile.java.TestCompilerCompile`
```
[2022-01-19T14:19:55.882Z] TEST RESULT: Error. Program
`/home/jenkins/workspace/Test_openjdk8_hs_extended.openjdk_x86-64_linux_testList_1/openjdkbinary/j2sdk-image/bin/java'
timed out (timeout set to 960000ms, elapsed time including timeout handling was 960365ms).
```

jdk/jfr/event/runtime/TestShutdownEvent.java.TestShutdownEvent
```
[2022-01-19T14:27:29.508Z] TEST RESULT: Error. Program
`/home/jenkins/workspace/Test_openjdk8_hs_extended.openjdk_x86-64_linux_testList_1/openjdkbinary/j2sdk-image/bin/java'
timed out (timeout set to 960000ms, elapsed time including timeout handling was 960366ms).
```

jdk/jfr/event/runtime/TestShutdownEvent.java.TestShutdownEvent has been excluded on aarch64 linux but not yet for xLinux
https://github.com/adoptium/aqa-tests/pull/3007

Start with the two failing tests, jdk/jfr/event/compiler/TestCompilerCompile.java.TestCompilerCompile and jdk/jfr/event/runtime/TestShutdownEvent.java.TestShutdownEvent, and review the linked xLinux test report. Compare the existing aarch64 exclusion in adoptium/aqa-tests#3007 with the xLinux configuration. Done means the affected tests no longer time out or are appropriately excluded on xLinux.

Written by the indexing model from the issue text.