serviceability/dcmd/vm tests fail for ZGC after JDK-8322475

Two tests fail, presumably after JDK-8322475. The tests are failing when run with "-XX:+UseZGC" (and "-XX:+UseZGC -XX:-ZGenerational"), not yet sure if other modes also trigger the failures.

serviceability/dcmd/vm/SystemMapTest.java

test SystemMapTest.jmx(): failure
java.lang.RuntimeException: '0x\\p{XDigit}+-0x\\p{XDigit}+ +\\d+ +[rwsxp-]+ +\\d+ +\\d+ +(4K|8K|16K|64K|2M|16M|64M) +com.*JAVAHEAP.*' missing from stdout/stderr
at jdk.test.lib.process.OutputAnalyzer.shouldMatch(OutputAnalyzer.java:371)
at SystemMapTest.run(SystemMapTest.java:50)
at SystemMapTest.jmx(SystemMapTest.java:57)



serviceability/dcmd/vm/SystemDumpMapTest.java

Missing patterns in dump:
0x\\p{XDigit}+-0x\\p{XDigit}+ +\\d+ +[rwsxp-]+ +\\d+ +\\d+ +(4K|8K|16K|64K|2M|16M|64M) +com.*JAVAHEAP.*
test SystemDumpMapTest.jmx(): failure
java.lang.RuntimeException: java.lang.RuntimeException: Missing patterns
...