[llvm] AMDGPU/GlobalISel: Add skeletons for new register bank select passes (PR #112862)

[Diana Picus via llvm-commits]

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@@ -1371,7 +1378,12 @@ void GCNPassConfig::addPreRegBankSelect() {
 }
 
 bool GCNPassConfig::addRegBankSelect() {
-  addPass(new AMDGPURegBankSelect());
+  if (NewRegBankSelect) {
+    addPass(createAMDGPURBSelectPass());
+    addPass(createAMDGPURBLegalizePass());
+  } else {
+    addPass(new AMDGPURegBankSelect());
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rovka wrote:

Could we just modify this AMDGPURegBankSelect instead of adding a new one? It was meant to use uniformity analysis too. Maybe you can propagate the flag into the pass if you want to keep the old behaviour around in the meantime.

https://github.com/llvm/llvm-project/pull/112862