Fix simulator register numbering.

2013-03-21  Jeremy Bennett <jeremy.bennett@embecosm.com>

	* arc-elf-tdep.c: Include simulator register header.
	(arc_elf_sim_map): New function.
	(arc_gdbarch_osabi_init): Set simulator register mapping.
	* arc-tdep.h: Add simulator register numbers for aux regs.