Changed ARCv2 EM option from -mEM to -mav2em

2013-04-17 Claudiu Zissulescu <claziss@synopsys.com>

  * doc/invoke.texi: Change the option -mcpu=EM into -mcpu=ARCv2EM, and change the -mEM driver option to -mav2em
  * common/config/arc/arc-common.c:  Likewise
  * config/arc/arc-opts.h: Likewise
  * config/arc/arc.c: Likewise
  * config/arc/arc.h: Likewise
  * config/arc/arc.opt: Likewise

Conflicts (resolved):
	gcc/ChangeLog.ARC
	gcc/common/config/arc/arc-common.c
	gcc/config/arc/arc-opts.h
	gcc/config/arc/arc.c
	gcc/config/arc/arc.h
	gcc/config/arc/arc.opt
	gcc/doc/invoke.texi