mips: add Ingenic MXU, MXU2 and MXU3 detection - #188
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Add runtime ISA probes for Ingenic MIPS SIMD extensions:
mxu: classic XBurst MXU vias32and xr0,xr0,xr0mxu2: 128-bit MXU2 viaandv $vr0,$vr0,$vr0mxu3: 512-bit MXU3 viaandv $vr0,$vr0,$vr0The probes use raw instruction encodings, matching ruapu's existing MIPS detection style and avoiding a dependency on Ingenic-specific assembler support.
Also expose the three features in the example program.