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

[Jan Voung via llvm-commits]

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@@ -81,6 +81,86 @@ void ConstantRangeList::insert(const ConstantRange &NewRange) {
   }
 }
 
+ConstantRangeList
+ConstantRangeList::unionWith(const ConstantRangeList &CRL) const {
+  assert(getBitWidth() == CRL.getBitWidth() &&
+         "ConstantRangeList types don't agree!");
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jvoung wrote:

nit: maybe "bitwidths" instead of "types" to be more specific?

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