blas/gonum,floats,internal/asm/f32: use L1 norm asm implementation where possible

[kortschak]

Please take a look.

[codecov-commenter]

Codecov Report

Patch coverage: 28.57% and project coverage change: -0.01% ⚠️

Comparison is base (93223b4) 74.00% compared to head (3feedd3) 73.99%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1889      +/-   ##
==========================================
- Coverage   74.00%   73.99%   -0.01%     
==========================================
  Files         526      527       +1     
  Lines       63210    63211       +1     
==========================================
- Hits        46778    46776       -2     
- Misses      13854    13858       +4     
+ Partials     2578     2577       -1     

Files Changed	Coverage Δ
blas/gonum/level1float32.go	0.00% <0.00%> (ø)
internal/asm/f32/stubs_amd64.go	0.00% <0.00%> (ø)
internal/asm/f32/stubs_noasm.go	85.71% <0.00%> (-14.29%)	⬇️
internal/asm/f64/stubs_noasm.go	100.00% <ø> (ø)
blas/gonum/level1float64.go	98.60% <100.00%> (-0.02%)	⬇️
floats/floats.go	99.03% <100.00%> (-0.01%)	⬇️
lapack/gonum/dlangb.go	71.42% <100.00%> (ø)

... and 1 file with indirect coverage changes

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