RFR: 8310275: Bug in assignment operator of ReservedMemoryRegion

[Ralf Schmelter]

8310275: Bug in assignment operator of ReservedMemoryRegion

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Commit messages:
 - Adjust to MacOSX missing implementation of os::committed_in_range()
 - Ensure we don't accidentally commited memory
 - More debug data added
 - Track more committed values in test to pinpoint where problems occurr
 - More debugging output in the test to find problems.
 - Improved test (mostly comments)
 - Fixed copyright and whitespaces
 - Merge branch 'master' of https://github.com/openjdk/jdk into virt-mem-test
 - Remove debug code not needed which doesn't compile
 - Added missing include
 - ... and 1 more: https://git.openjdk.org/jdk/compare/6473a7df...8a543f29

Changes: https://git.openjdk.org/jdk/pull/14440/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14440&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310275
  Stats: 92 lines in 2 files changed: 92 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