RFR: 8350567: NMT: update VMATree::register_mapping to copy the existing tag of the region [v2]

[Afshin Zafari]

On Sun, 2 Mar 2025 20:16:36 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> test/hotspot/gtest/nmt/test_vmatree.cpp line 728:
>> 
>>> 726: }
>>> 727: 
>>> 728: TEST_VM_F(NMTVMATreeTest, CommitUseFlagInplace) {
>> 
>> Change this test to use `expect_equivalent_form`, see other usages to see what should look like. You can add multiple checks even, so that we get how the range changes over time.
>
> Is the bug actually in the summary accounting? If so, I'd like to see a better test name here that indicates that and *not* change this to `expect_equivalent_form` and so on.

New name chosen.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23771#discussion_r1977356624