[llvm] [IVDescriptors] Implement MonotonicDescriptor (PR #214490)

[Luke Lau via llvm-commits]

================
@@ -29,6 +29,7 @@ class PredicatedScalarEvolution;
 class ScalarEvolution;
 class SCEV;
 class SCEVPredicate;
+class SCEVAddRecExpr;
----------------
lukel97 wrote:

I think this is dead now

https://github.com/llvm/llvm-project/pull/214490