RFR: 8310275: Bug in assignment operator of ReservedMemoryRegion [v4]

[Ralf Schmelter]

> 8310275: Bug in assignment operator of ReservedMemoryRegion

Ralf Schmelter has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 17 commits:

 - Don't change the type later on
 - Merge branch 'master' of https://github.com/openjdk/jdk into virt-mem-test
 - Delete old test
 - merge?
 - Fixed test name
 - Adjust to MacOSX missing implementation of os::committed_in_range()
 - Test just the assignement operator as suggested
 - Ensure we don't accidentally commited memory
 - More debug data added
 - Track more committed values in test to pinpoint where problems occurr
 - ... and 7 more: https://git.openjdk.org/jdk/compare/a1115a7a...7031cf8b

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Changes: https://git.openjdk.org/jdk/pull/14440/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14440&range=03
  Stats: 53 lines in 2 files changed: 53 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14440.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14440/head:pull/14440

PR: https://git.openjdk.org/jdk/pull/14440