[llvm] [AMDGPU] Use larger immediate values in S_NOP (PR #158990)

[Jay Foad via llvm-commits]

jayfoad wrote:

The first commit just contains some auto-check-regerenation. If you're skimming the test diffs you may prefer to look at the second commit only.

https://github.com/llvm/llvm-project/pull/158990