Pull up following revision(s) (requested by spz in ticket #988):
	sys/kern/uipc_socket.c: revision 1.220
PR/48098: Brian Marcotte: panic: kernel diagnostic assertion "cred != NULL":
Fix from Michael van Elst, tcpdrop crashes kernel on ebryonic connections.
Pull up following revision(s) (requested by para in ticket #989):
	sys/uvm/uvm_km.c: revision 1.125
uvm_km_kmem_alloc: don't hardcode kmem_va_arena
tickets 988 989