[OCaml] Remove add_constant_propagation

After https://reviews.llvm.org/D85159.

Author: aeubanks

llvm/bindings/ocaml/transforms/scalar_opts/llvm_scalar_opts.ml

@@ -96,9 +96,6 @@ external add_lib_call_simplification
 external add_tail_call_elimination
   : [< Llvm.PassManager.any ] Llvm.PassManager.t -> unit
   = "llvm_add_tail_call_elimination"
-external add_constant_propagation
-  : [< Llvm.PassManager.any ] Llvm.PassManager.t -> unit
-  = "llvm_add_constant_propagation"
 external add_memory_to_register_demotion
   : [< Llvm.PassManager.any ] Llvm.PassManager.t -> unit
   = "llvm_add_demote_memory_to_register"