[ECOS] MIPS R3000 patch for MIPS arch

[sun409@pchome.com.tw]

The attach is the patch file for MIPS architecture to
make the source codes in hal/mips/arch/ directory comply
with MIPS I ISA.

There are mainly two kinds of modification:
1. Add a delay slot after lw insn.
2. Change non-MIPS I insn. to equiv. MIPS I insn.

I hope you in Cygnus could accept this patch.
And, any further modification to the hal/mips/arch/
will not use instructions other than MIPS I.

Regards,

Tim Ouyang
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