[llvm] [AMDGPU] SelectionDAG divergence tracking should take into account Target divergency. (PR #144947)

[Jay Foad via llvm-commits]

================
@@ -2327,7 +2328,8 @@ SDValue SelectionDAG::getRegister(Register Reg, EVT VT) {
     return SDValue(E, 0);
 
   auto *N = newSDNode<RegisterSDNode>(Reg, VTs);
-  N->SDNodeBits.IsDivergent = TLI->isSDNodeSourceOfDivergence(N, FLI, UA);
+  N->SDNodeBits.IsDivergent =
+      DivergentTarget ? TLI->isSDNodeSourceOfDivergence(N, FLI, UA) : false;
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jayfoad wrote:

Nit:
```suggestion
      DivergentTarget && TLI->isSDNodeSourceOfDivergence(N, FLI, UA);
```

https://github.com/llvm/llvm-project/pull/144947