[llvm] [AMDGPU] Documentation files for GFX950 instructions (PR #184710)

[Shilei Tian via llvm-commits]

shiltian wrote:

> but parsing tblgen dump shows that info in def V_MFMA_F32_16X16X128_F8F6F4_f8_f8_e64 :

There needs to be a table gen backend for this, instead of parsing the dump.

https://github.com/llvm/llvm-project/pull/184710