[llvm] [AMDGPU][RFC] Combine asm and disasm tests. (PR #90179)

[Ivan Kosarev via llvm-commits]

kosarev wrote:

> Instead of teaching the disassembler to extract hex bytes from `encoding: [...]`, I think I'd prefer creating a new assembler option `-filetype=hex` (subject to bikeshedding) that would produce output in the form that the disassembler expects:
ould produce identical output to `dis file.txt | asm | dis`.

Tried that in https://github.com/llvm/llvm-project/pull/90214.

https://github.com/llvm/llvm-project/pull/90179