[llvm] AMDGPU/GlobalISel: Uniformity info based regbankselect (PR #73684)

[Matt Arsenault via llvm-commits]

================
@@ -68,7 +71,26 @@ bool AMDGPURegBankSelect::runOnMachineFunction(MachineFunction &MF) {
   MachineUniformityInfo Uniformity =
       computeMachineUniformityInfo(MF, CycleInfo, DomTree.getBase(),
                                    !ST.isSingleLaneExecution(F));
-  (void)Uniformity; // TODO: Use this
+
+  // Switch for uniformity info based regbank selection. Pre-selects register
+  // bank on dst registers using machine uniformity analysis.
+  // Keep in sinc with switches in getInstrMapping and applyMappingImpl.
----------------
arsenm wrote:

```suggestion
  // Keep in sync with switches in getInstrMapping and applyMappingImpl.
```

https://github.com/llvm/llvm-project/pull/73684