[llvm] [AMDGPU] Remove dead check lines from tests (NFC) (PR #228002)

[Jay Foad via llvm-commits]

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@@ -680,11 +680,9 @@ s_fmamk_f32 s5, s1, 0x11213141, s105
 
 s_fmamk_f32 s5, 0x11213141, 0x11213141, s105
 // GFX12: s_fmamk_f32 s5, 0x11213141, 0x11213141, s105 ; encoding: [0xff,0x69,0x05,0xa3,0x41,0x31,0x21,0x11]
-// GFX12 encoding: [0xff,0x69,0x05,0xa3,0x41,0x31,0x21,0x11]
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jayfoad wrote:

These are fine.

https://github.com/llvm/llvm-project/pull/228002