Merge in EM working branch

Conflicts:
	ChangeLog.ARC
	bfd/ChangeLog.ARC
	bfd/cpu-arc.c
	bfd/elf32-arc.c
	gas/ChangeLog.ARC
	gas/config/tc-arc.c
	opcodes/ChangeLog.ARC
	opcodes/arc-opc-old.c

Conflicts (from 2.23.2):
	gas/config/tc-arc.c