RFR: 8370578: SystemMapTest.java#normal fails intermittendly on macOS aarch64

[Simon Tooke]

This PR addresses [JDK-8370578](https://bugs.openjdk.org/browse/JDK-8370578)  

Under certain circumstances, OpenJDK on macOS maps the hsperf segment private instead of shared; one of those cases is hit during the tier1 tests, which test for that.  

This PR allows for shared or private mapping; the purpose of the intermittently failing test is to test System.map implementation, not JDK internals.

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Commit messages:
 - allow private or shared hsperf segment

Changes: https://git.openjdk.org/jdk/pull/28025/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28025&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370578
  Stats: 5 lines in 1 file changed: 2 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/28025.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28025/head:pull/28025

PR: https://git.openjdk.org/jdk/pull/28025