[llvm] [AMDGPU][True16][CodeGen] true16 codegen pat for fptrunc_round (PR #124044)

[Ivan Kosarev via llvm-commits]

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@@ -178,18 +180,21 @@ Status SIModeRegister::getInstructionMode(MachineInstr &MI,
       unsigned Mode = MI.getOperand(2).getImm();
       MI.removeOperand(2);
       // Replacing the pseudo by a real instruction in place
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kosarev wrote:

We can probably remove these comments. It's pretty obvious we do setDesc() here.

https://github.com/llvm/llvm-project/pull/124044