[llvm] AMDGPU/GlobalISelDivergenceLowering: select divergent i1 phis (PR #80003)

[Pierre van Houtryve via llvm-commits]

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@@ -752,6 +752,17 @@ class MachineRegisterInfo {
   Register createVirtualRegister(const TargetRegisterClass *RegClass,
                                  StringRef Name = "");
 
+  /// All avilable attributes a virtual register can have.
+  struct RegisterAttributes {
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Pierre-vh wrote:

I'm not sure I understand why this is needed. It seems like it's just an additional helper to create a new register with a type + RC/RB all in one right?

If so I think it should be contained to `SILowerI1Copies`, a new MachineRegisterInfo helper is not really needed, or at least not one with a new type just for it (+ the name "Attribute" is confusing in this context). I'd just pass two arguments to the function directly.

https://github.com/llvm/llvm-project/pull/80003