RFR: 8346927: serviceability/dcmd/vm/[SystemMapTest.java|SystemDumpMapTest.java] fail at jmx

[Simon Tooke]

This fix widens the regex used to determine if a JAVAHEAP line is correct in the output of System.map/System.dump_map.

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Commit messages:
 - widen JAVAHEAP regex again

Changes: https://git.openjdk.org/jdk/pull/23205/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23205&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8346927
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23205.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23205/head:pull/23205

PR: https://git.openjdk.org/jdk/pull/23205