[llvm] Add ConstantRangeList::unionWith() and ::intersectWith() (PR #96547)

[Jan Voung via llvm-commits]

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@@ -72,6 +72,14 @@ class [[nodiscard]] ConstantRangeList {
                          APInt(64, Upper, /*isSigned=*/true)));
   }
 
+  /// Return the range list that results from the union of this range
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jvoung wrote:

small nit: "of this range *list* with another..." or "of this list with another" ?

https://github.com/llvm/llvm-project/pull/96547