[llvm] [CodeGenPrepare] Extend SimplifyCFG to lower s/ucmp + 3-arm switch (PR #223268)

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``````````diff
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 431234d99..72fa0d73a 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -8102,8 +8102,8 @@ bool CodeGenPrepare::optimizeSwitchOfCmpIntrinsic(SwitchInst *SI) {
     CmpInst::Predicate Pred = Result < 0   ? Cmp->getLTPredicate()
                               : Result > 0 ? Cmp->getGTPredicate()
                                            : CmpInst::ICMP_EQ;
-    Arms.push_back({Dest, Pred, BPI->getEdgeProbability(SwitchBB, Index),
-                     Weights[Index]});
+    Arms.push_back(
+        {Dest, Pred, BPI->getEdgeProbability(SwitchBB, Index), Weights[Index]});
   };
 
   // The results -1, 0 and 1 sum to zero, so with two cases the default takes
@@ -8123,7 +8123,6 @@ bool CodeGenPrepare::optimizeSwitchOfCmpIntrinsic(SwitchInst *SI) {
   // Test the most likely arm first.
   stable_sort(Arms, [](const Arm &A, const Arm &B) { return A.Prob > B.Prob; });
 
-
   // Check if any BBs contain a loop backedge.
   MDNode *LoopMD = SI->getMetadata(LLVMContext::MD_loop);
   auto IsBackedge = [&](const Arm &A) {

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https://github.com/llvm/llvm-project/pull/223268