[llvm] [AMDGPU][MC]FMA-mix instructions should not be supported in GFX908 etc. (PR #109873)

[Jun Wang via llvm-commits]

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@@ -1426,7 +1425,6 @@ def FeatureISAVersion9_4_Common : FeatureSet<
   [FeatureGFX9,
    FeatureGFX90AInsts,
    FeatureGFX940Insts,
-   FeatureFmaMixInsts,
----------------
jwanggit86 wrote:

> I am not saying they are wrong. I am saying it was wrong decision to change instructions and keep the name.

Could you please elaborate on this? (1) Is the "wrong decision" in the code or in the ISA doc? (2) By "change instructions and keep the name", did you mean the mad_mix  name is kept in the ISA doc but is actually used for a different instruction than the mad_mix instruction in previous versions, say gfx900?

https://github.com/llvm/llvm-project/pull/109873