Add mat-vec mul. Fixes #83.

[chriselrod]

No description provided.

[chriselrod]

Also fixes #81 .

[codecov]

Codecov Report

Merging #95 (521065b) into master (0292d3f) will increase coverage by 0.19%.
The diff coverage is 89.36%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   86.60%   86.79%   +0.19%     
==========================================
  Files          11       11              
  Lines         724      742      +18     
==========================================
+ Hits          627      644      +17     
- Misses         97       98       +1     

Impacted Files	Coverage Δ
src/matmul.jl	90.97% <83.87%> (+0.60%)	⬆️
src/complex_matmul.jl	100.00% <100.00%> (ø)
src/macrokernels.jl	88.23% <100.00%> (ø)
src/utils.jl	67.64% <100.00%> (ø)
src/funcptrs.jl	97.05% <0.00%> (-2.95%)	⬇️
src/block_sizes.jl	96.66% <0.00%> (+1.66%)	⬆️

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