Fails like this:

$ CONF=linux-x86_64-server-fastdebug make run-test 
TEST=java/lang/management/ManagementFactory/MXBeanException.java 
TEST_VM_OPTS="-XX:+UseShenandoahGC"

...

java.lang.NullPointerException: Cannot invoke 
"java.lang.management.MemoryPoolMXBean.setUsageThreshold(long)" because 
"MXBeanException.pool" is null


This test tries to find the pool that is `!p.isUsageThresholdSupported()`, and 
for Shenandoah there is no such pool. Likewise with ZGC, which is already 
filtered.

Additional testing:
 - [x] Affected test is now skipped for Shenandoah
 - [x] Affected test is still skipped for Z
 - [x] Affected test is still passing for G1

-------------

Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/5757/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5757&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274522
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5757.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5757/head:pull/5757

PR: https://git.openjdk.java.net/jdk/pull/5757

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