Defines starting with `m' in osfmk/ipc

• MACH_PORT_LARGEST osfmk/ipc/ipc_splay.c:184
• MACH_PORT_SMALLEST osfmk/ipc/ipc_splay.c:183
• MACH_PORT_UREFS_MAX osfmk/ipc/port.h:76
• MAX_REFS osfmk/ipc/ipc_port.c:1624
• MSG_OOL_SIZE_SMALL osfmk/ipc/ipc_init.c:410