RFR: 8340103: Add internal set_flag function to VMATree [v17]

[Thomas Stuefe]

On Wed, 6 Nov 2024 10:28:04 GMT, Johan Sjölen <jsjolen at openjdk.org> wrote:

>> Hi!
>> 
>> The old VirtualMemoryTracker has a method set_reserved_region_type(address, flag). We implement this for the new VMATree implementation by altering the signature slightly to set_reserved_region_type(address, size, flag). This simplifies the implementation greatly for our new data structure and leads to trivial changes for the callers (all callers already know the size).
>> 
>> This PR implements the internal implementation along with tests, but does not change any callers.
>> 
>> I also do a few cleanups:
>> 
>> - Change `Node` to `TreeNode` in tests, we've seen build failures because of this (probably a precompiled headers issue)
>> - Add a few `print_on` methods for  easy debugging
>> - Add a `size` alias, it was a bit confusing that some functions took an argument `position sz`, so changed that to `size sz` 
>> 
>> Thanks.
>
> Johan Sjölen has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Use size type and size argument name uniformly
>  - Avoid style discussion by adopting an already accepted style :D

Tests: very nice. Comments inline.

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PR Review: https://git.openjdk.org/jdk/pull/20994#pullrequestreview-2417806401