[llvm] [SelectionDAGBuilder] Fix non-determanism in `shouldKeepJumpConditionsTogether` (PR #83687)

[NAKAMURA Takumi via llvm-commits]

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@@ -2527,16 +2530,20 @@ bool SelectionDAGBuilder::shouldKeepJumpConditionsTogether(
 
   // Collect "all" instructions that lhs condition is dependent on.
   SmallPtrSet<const Instruction *, 8> LhsDeps, RhsDeps;
+  SmallVector<const Instruction *> RhsDepsItOrder;
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chapuni wrote:

We could use `SmallMapVector` with dummy vals for easy solution.

https://github.com/llvm/llvm-project/pull/83687