mips mxu2 infrastructure

[nihui]

[codecov-commenter]

Codecov Report

Merging #3666 (78fbc0f) into master (28e0c91) will increase coverage by 0.03%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #3666      +/-   ##
==========================================
+ Coverage   93.87%   93.90%   +0.03%     
==========================================
  Files         728      728              
  Lines      176826   176828       +2     
==========================================
+ Hits       166001   166059      +58     
+ Misses      10825    10769      -56     

Impacted Files	Coverage Δ
src/cpu.cpp	65.37% <0.00%> (+1.30%)	:arrow_up:
src/layer.cpp	46.00% <ø> (ø)
src/layer/mips/absval_mips.cpp	100.00% <ø> (ø)
src/layer/mips/bias_mips.cpp	100.00% <ø> (ø)
src/layer/mips/binaryop_mips.cpp	94.13% <ø> (ø)
src/layer/mips/clip_mips.cpp	100.00% <ø> (ø)
src/layer/mips/concat_mips.cpp	95.58% <ø> (ø)
src/layer/mips/convolution1d_mips.cpp	97.12% <ø> (ø)
src/layer/mips/convolution_mips.cpp	97.76% <ø> (ø)
src/layer/mips/convolutiondepthwise_mips.cpp	97.63% <ø> (ø)
... and 29 more

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