RFR: 8267339: macos attempt_reserve_memory_at(arg1, arg2, true) failure

[Gerard Ziemski]

After adding the fix for https://bugs.openjdk.java.net/browse/JDK-8262952 #3865 on macOS aarch64, things broke on macOS x64. For my initial analysis please see https://bugs.openjdk.java.net/browse/JDK-8267339

The real fix for this issue is tracked by JDK-8267339, however, here we need a quick workaround to get the build fixed, so this is a temporary workaround where we disable the test in question until we have the real fix.

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Commit messages:
 - temporarily disable release_multi_mappings test on macOS x64

Changes: https://git.openjdk.java.net/jdk/pull/4100/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4100&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267339
  Stats: 5 lines in 1 file changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4100.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4100/head:pull/4100

PR: https://git.openjdk.java.net/jdk/pull/4100