PATCH: Add -march support for MIPS 1004K cores

[Sandra Loosemore]

The attached patch adds -march support for MIPS 1004K cores.  The 1004K is 
approximately a 34K adapted for SMP so I have just copied all the existing bits 
that reference the 34K.  It has similar variants as the 34K:

1004Kc = integer only
1004Kf2_1 = half-speed FPU
1004Kf1_1 = full-speed FPU
1004Kf = alias for 1004Kf2_1

OK to commit?

-Sandra
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