external instr_opcode : llvalue -> Opcode.t = "llvm_instr_get_opcode"
external icmp_predicate : llvalue -> Icmp.t option = "llvm_instr_icmp_predicate"
external instr_opcode : llvalue -> Opcode.t = "llvm_instr_get_opcode"
external icmp_predicate : llvalue -> Icmp.t option = "llvm_instr_icmp_predicate"