[llvm] [SPIR-V] Add SPIRV to LLVM_ALL_TARGETS (PR #119653)

[via llvm-commits]

kanashimia wrote:

Hello, sorry to but in, but although OpenCL flavoured SPIR-V backend is pretty stable and robust at this point, Vulkan flavoured SPIR-V backend is definitely not, as was said above, and there is quite a big difference between the two. Thanks to @Keenuts there was a lot of progress on it, but there is still a lot of work to do, and it is still rapidly changing, it is still nowhere near usable at this point. This should be reflected in the documentation of the backend at least. It is not a blocker and can be done in a separate patch, just want to point this out. Maybe Vulkan support could be gated under a separate compilation flag, but probably doesn't matter much.  

https://github.com/llvm/llvm-project/pull/119653