[PATCH, MIPS] Add 34Kn cpu

[Sandra Loosemore]

This patch makes GCC know about -march=34kn.  MIPS asked us to add 
support for this processor to our local source base a couple of years 
ago; it's basically a 34Kc without the DSP ASE.  OK for mainline?

I have posted the corresponding assembler patch here:
http://sourceware.org/ml/binutils/2012-08/msg00008.html

-Sandra


2012-08-01  Catherine Moore  <clm@codesourcery.com>
	    Sandra Loosemore  <sandra@codesourcery.com>

	gcc/
	* config/mips/mips-cpus.def (34kn): New.
	* config/mips/mips.h (MIPS_ARCH_FLOAT_SPEC): Add 34kn.
	(BASE_DRIVER_SELF_SPECS): Do not imply -mdsp for the 34kn.
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