Llvm_ipo

`sig
external add_argument_promotion : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_argument_promotion"
external add_constant_merge : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_constant_merge"
external add_merge_functions : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_merge_functions"
external add_dead_arg_elimination : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_dead_arg_elimination"
external add_function_attrs : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_function_attrs"
external add_function_inlining : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_function_inlining"
external add_always_inliner : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_always_inliner"
external add_global_dce : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_global_dce"
external add_global_optimizer : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_global_optimizer"
external add_prune_eh : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_prune_eh"
external add_ipsccp : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_ipsccp"
external add_internalize :
[ `Module ] Llvm.PassManager.t -> all_but_main:bool -> unit
= "llvm_add_internalize"
external add_strip_dead_prototypes : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_strip_dead_prototypes"
external add_strip_symbols : [ `Module ] Llvm.PassManager.t -> unit
= "llvm_add_strip_symbols"
end`