[perf] various latency improvements

[odow]

Part of jump-dev/MathOptInterface.jl#1709

[codecov]

Codecov Report

Merging #128 (7a69ec6) into master (a0f3228) will decrease coverage by 3.37%.
The diff coverage is 26.66%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
- Coverage   61.31%   57.94%   -3.38%     
==========================================
  Files           3        4       +1     
  Lines         698      711      +13     
==========================================
- Hits          428      412      -16     
- Misses        270      299      +29     

Impacted Files	Coverage Δ
src/Clp.jl	0.00% <ø> (ø)
src/precompile.jl	0.00% <0.00%> (ø)
src/MOI_wrapper/MOI_wrapper.jl	90.64% <100.00%> (-0.54%)	⬇️
src/libClp.jl	28.65% <0.00%> (-4.50%)	⬇️

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