[llvm] [NaryReassociate] Teach NaryReassociate about UniformityAnalysis (PR #175167)

[Pankaj Dwivedi via llvm-commits]

================
@@ -482,6 +513,41 @@ Instruction *NaryReassociatePass::tryReassociateBinaryOp(Value *LHS, Value *RHS,
     //   = (A op RHS) op B or (B op RHS) op A
     SCEVUse AExpr = SE->getSCEV(A), BExpr = SE->getSCEV(B);
     SCEVUse RHSExpr = SE->getSCEV(RHS);
+
+    // When uniformity analysis is available, prefer reassociations that group
----------------
PankajDwivedi-25 wrote:

Agree.

https://github.com/llvm/llvm-project/pull/175167