[llvm] [GlobalIsel] Combine select to integer minmax. (PR #77213)

[Matt Arsenault via llvm-commits]

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@@ -6548,6 +6548,87 @@ bool CombinerHelper::tryFoldBoolSelectToLogic(GSelect *Select,
   return false;
 }
 
+bool CombinerHelper::tryFoldSelectToIntMinMax(GSelect *Select,
+                                              BuildFnTy &MatchInfo) {
+  Register DstReg = Select->getReg(0);
+  Register Cond = Select->getCondReg();
+  Register True = Select->getTrueReg();
+  Register False = Select->getFalseReg();
+  LLT DstTy = MRI.getType(DstReg);
+
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arsenm wrote:

Missing hasOneUse check?

https://github.com/llvm/llvm-project/pull/77213