RFR: 8335643: serviceability/dcmd/vm tests fail for ZGC after JDK-8322475

[Thomas Stuefe]

The new System.map facility fails its tests when the JVM is using ZGC. The facility is working fine, but the test checks for the java heap to appear as committed non-shared memory segment, but on ZGC we reserve the memory as shared memory.

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Commit messages:
 - JDK-8335643-serviceability-dcmd-vm-tests-fail-for-ZGC-after-JDK-8322475

Changes: https://git.openjdk.org/jdk/pull/20034/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20034&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8335643
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20034.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20034/head:pull/20034

PR: https://git.openjdk.org/jdk/pull/20034