[jdk11u-dev] RFR: 8255254: Split os::reserve_memory and os::map_memory_to_file interfaces

[Vladimir Kempik]

8255254: Split os::reserve_memory and os::map_memory_to_file interfaces

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Commit messages:
 - Merge branch 'master' into JDK-8255254
 - 8255254: Split os::reserve_memory and os::map_memory_to_file interfaces

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/568/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=568&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255254
  Stats: 168 lines in 9 files changed: 88 ins; 51 del; 29 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/568.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/568/head:pull/568

PR: https://git.openjdk.java.net/jdk11u-dev/pull/568