[clang] [llvm] Add support for Windows hot-patching (PR #138972)

[via llvm-commits]

sivadeilra wrote:

For context, here are recent Microsoft announcements concerning hot-patching:

* https://www.microsoft.com/en-us/windows-server/blog/2025/04/24/tired-of-all-the-restarts-get-hotpatching-for-windows-server/?msockid=19a6f8f09bd160ac0b18ed449afc614b
* https://techcommunity.microsoft.com/blog/windows-itpro-blog/hotpatch-for-windows-client-now-available/4399808

https://github.com/llvm/llvm-project/pull/138972