Revert "[vm][windows] Implement VirtualMemory::FreeSubSegment"
Revert "[vm][windows] Implement VirtualMemory::FreeSubSegment"

This reverts commit fc775b3e9ba7631c01e4725ac8f7a59d22b2268f.

Reason for revert: Crashes in FreeVirtualMemory on the bots.

Original change's description:
> [vm][windows] Implement VirtualMemory::FreeSubSegment
> 
> related #27505
> 
> Change-Id: I3d500a041def348e8dd61bd16e0516cf5eaf38c2
> Reviewed-on: https://dart-review.googlesource.com/52520
> Reviewed-by: Ryan Macnak <rmacnak@google.com>
> Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
> Commit-Queue: Zach Anderson <9f8b31e960a68dade71618f1ff6da6e23a1edfc9@google.com>

TBR=vegorov@google.com,rmacnak@google.com,9f8b31e960a68dade71618f1ff6da6e23a1edfc9@google.com

Change-Id: I2dd3fc163165773022b16735d415e11b0fa50f8e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/52540
Reviewed-by: Zach Anderson <9f8b31e960a68dade71618f1ff6da6e23a1edfc9@google.com>
Commit-Queue: Zach Anderson <9f8b31e960a68dade71618f1ff6da6e23a1edfc9@google.com>

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