Allow bf16 operands on new MFMAs (#144925) New gfx950 MFMA allows bf16 operands. https://github.com/llvm/llvm-project/blob/c0cc81cdc03c97473ba771bbc3a2330bd22396bc/llvm/include/llvm/IR/IntrinsicsAMDGPU.td#L3434 When running `amdgpu-to-rocdl`, Current logic converts bf16 to i16 always which fails to compile for newer bf16 MFMA e.g. `v_mfma_f32_16x16x32bf16`. Backend expects bf16 type for the operands for those newer MFMAs. This patch fixes it. CC: @krzysz00 @dhernandez0 @giuseros @antiagainst @kuhar
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