[llvm] [AMDGPU][RFC] Combine asm and disasm tests. (PR #90214)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> @MaskRay `llvm-objdump -d` doesn't use the asm streamer, meaning it would require separate check lines, whereas the idea is to make same check lines work for both the assembler and disassembler tests.
> 
> Regarding round-tripping, we may want to consider that at some point, but we still need to directly check what the disassembler produces, because reassembling may mask problems.

Can you give an example that llvm-objdump is insufficient for your case?

https://github.com/llvm/llvm-project/pull/90214