[llvm] [DirectX] Add Range Overlap validation (PR #152229)

[Justin Bogner via llvm-commits]

https://github.com/bogner commented:

We probably need some more tests here, but it looks like it's moving in the right direction.

Please run the [offload-test-suite](https://github.com/llvm-beanz/offload-test-suite) for this kind of change - trying it locally I see a lot of failures. Most of them look like they're the same issue as #152250, but even after cherry picking that change there are a number of failures.

https://github.com/llvm/llvm-project/pull/152229