[llvm] [AMDGPU][MC] Allow nodone etc. in exp instructions (PR #172749)

[Jun Wang via llvm-commits]

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jwanggit86 wrote:

`gfx10_asm_exp.s` is a new file. There were no tests for gfx10 that test the exp instructions.

https://github.com/llvm/llvm-project/pull/172749