[llvm] [AMDGPU] Allocate i1 argument to SGPRs (PR #72461)

[Matt Arsenault via llvm-commits]

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@@ -15864,7 +15910,8 @@ bool SITargetLowering::isSDNodeSourceOfDivergence(const SDNode *N,
     if (const Value *V = FLI->getValueFromVirtualReg(R->getReg()))
       return UA->isDivergent(V);
 
-    assert(Reg == FLI->DemoteRegister || isCopyFromRegOfInlineAsm(N));
+    assert(Reg == FLI->DemoteRegister || isCopyFromRegOfInlineAsm(N) ||
+           isCopyFromRegForI1Return(N));
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arsenm wrote:

This shouldn't be necessary? 

https://github.com/llvm/llvm-project/pull/72461