[jdk11u-dev] RFR: 8255254: Split os::reserve_memory and os::map_memory_to_file interfaces [v2]

[Vladimir Kempik]

> Please review this backport for JDK-8225254 which is needed for MAP_JIT support for jit regions on macos ( JDK-8234930 ). Both are prerequests for macos-aarch64 support.

Vladimir Kempik has updated the pull request incrementally with one additional commit since the last revision:

  Fix issue with memtracker

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk11u-dev/pull/568/files
  - new: https://git.openjdk.java.net/jdk11u-dev/pull/568/files/ddb57fa7..a432d0bd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=568&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=568&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 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