[clang] [libc] [llvm] [libc] Implement (v|f)printf on the GPU (PR #96369)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

Also, I just merged the prerequisite patches into this, to get the relevant changed just look at the most recent commit. The lack of stacked PRs in GitHub really irks me.

https://github.com/llvm/llvm-project/pull/96369