[clang] [llvm] [AMDGPU] Enable OpenCL hostcall printf (WIP) (PR #72556)

[Matt Arsenault via cfe-commits]

https://github.com/arsenm commented:

Is there a separate PR open for "Add vector processing support to AMDGPU printf"? I think it's easiest to move this part forward first 

https://github.com/llvm/llvm-project/pull/72556