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_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_ipc_propagation : [ `Module ] Llvm.PassManager.t -> unit = "llvm_add_ip_constant_propagation" 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`