[llvm] [AMDGPU] Implement llvm.fptosi.sat and llvm.fptoui.sat (PR #174726)

[Carl Ritson via llvm-commits]

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@@ -3762,6 +3767,52 @@ SDValue AMDGPUTargetLowering::LowerFP_TO_INT(const SDValue Op,
   return SDValue();
 }
 
+SDValue AMDGPUTargetLowering::LowerFP_TO_INT_SAT(const SDValue Op,
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perlfu wrote:

I thought `AMDGPUTargetLowering` was the most generic place for DAG ISel?

https://github.com/llvm/llvm-project/pull/174726