RFR: 8367249: [REDO] MemBaseline accesses VMT without using lock

[Johan Sjölen]

Hi,

This is a REDO, as the previous attempt caused build failures when merged with latest master.
The only difference is that the copy ctr for the RBTRee had been integrated with a different PR, but it never should have been. I deleted the copy ctr.

Thanks.

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Commit messages:
 - Delete unneeded copy ctr
 - Merge remote-tracking branch 'openjdk/master' into cleanup-membaseline
 - Missed const-ness
 - Move into rbTree.inline.hpp file
 - Merge remote-tracking branch 'openjdk/master' into cleanup-membaseline
 - Rename to _vma_allocations
 - After a lot of casting
 - Yup
 - Some more ugly casts
 - Aha, _root is typed as an IntrusiveRBNode
 - ... and 10 more: https://git.openjdk.org/jdk/compare/06326176...9539fe96

Changes: https://git.openjdk.org/jdk/pull/27170/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27170&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367249
  Stats: 235 lines in 12 files changed: 162 ins; 50 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/27170.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27170/head:pull/27170

PR: https://git.openjdk.org/jdk/pull/27170