[llvm] [AMDGPU] Account for inline asm size in inst_pref_size calculation (PR #192306)

[Jay Foad via llvm-commits]

jayfoad wrote:

No more comments from me. (I'm not in a position to approve the whole thing, I was just pointing out random things that looked like they could be improved.)

https://github.com/llvm/llvm-project/pull/192306