RFR: 8366241: NMT: Consolidate [Virtual/Committed/Reserved]Regions into one structure

[Afshin Zafari]

On Mon, 8 Sep 2025 08:55:50 GMT, Afshin Zafari <azafari at openjdk.org> wrote:

> The structures `CommittedMemoryRegion` and `ReservedMemoryRegion` are merged into the `VirtualMemoryRegion`.
> 
> Tests:
> tiers1-5, main platforms, debug/product

Waiting for [8366363](https://bugs.openjdk.org/browse/JDK-8366363) to be integrated. Those changes to be merged here.

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PR Comment: https://git.openjdk.org/jdk/pull/27137#issuecomment-3265298064