[PATCH ARC] Change default mach

[Cupertino Miranda]

Hi all,

The default arch (bfd_mach_arc_arcv2) has higher index value and code in arc_elf_merge_private_bfd_data would make it always the used arch for any output object.
The patch allows the output object arch to be of the same type as the first incoming object file.
Looking forward for your review.

Best regards,
Cupertino

bfd/ChangeLog:

Cupertino Miranda <Cupertino.Miranda@synopsys.com>
	* cpu-arc.c: Changed default archure from bfd_mach_arc_arcv2 
	to bfd_mach_arc_arc600
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