[llvm] [GenericDomTree][NFC] Use llvm algorithms (PR #97104)

[David Blaikie via llvm-commits]

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@@ -885,6 +874,12 @@ class DominatorTreeBase {
         NewBBIDom = findNearestCommonDominator(NewBBIDom, PredBlocks[i]);
     }
 
+    bool NewBBDominatesNewBBSucc =
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dwblaikie wrote:

Yeah, just makes things a bit clearer/easier to review, thanks!

https://github.com/llvm/llvm-project/pull/97104