[HLSL][LongVec] Add support for graphics intrinsics

Graphics intrinsics seem to be blocked by more than just enabling long vectors in the frontend and need further investigation.

Here are the easy ones
- [x] https://github.com/llvm/llvm-project/issues/220638
- [x] https://github.com/llvm/llvm-project/issues/220639

Here are the more compilicated ones since long vectors were added in https://github.com/llvm/llvm-project/pull/216905/:
- [ ] https://github.com/llvm/llvm-project/issues/220626
- [ ] https://github.com/llvm/llvm-project/issues/220628
- [ ] https://github.com/llvm/llvm-project/issues/220629
- [ ] https://github.com/llvm/llvm-project/issues/220630
- [ ] https://github.com/llvm/llvm-project/issues/220631

Start by reading the long-vector changes in pull request 216905 and the unresolved issues 220626 and 220628-220631, which identify the complicated graphics intrinsics. Investigate why those intrinsics remain blocked and use the listed issues as the scope; done means the remaining graphics intrinsics have support.

Written by the indexing model from the issue text.