[clang] [llvm] [LLVM] Fix incorrect alignment on AMDGPU variadics (PR #96370)

[Joseph Huber via cfe-commits]

jhuber6 wrote:

Lower than native alignment is legal in AMDGPU hardware and it's possible to work around in the `printf` implementation, closing.

https://github.com/llvm/llvm-project/pull/96370