Fix inference specialization in interpolations

[ChrisRackauckas]

Part of SciML/DifferentialEquations.jl#786

[codecov]

Codecov Report

Merging #99 (393011d) into master (3d04ae7) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff           @@
##           master     #99   +/-   ##
======================================
  Coverage    6.80%   6.80%           
======================================
  Files          39      39           
  Lines        2896    2896           
======================================
  Hits          197     197           
  Misses       2699    2699           

Impacted Files	Coverage Δ
src/solutions/dae_solutions.jl	0.00% <0.00%> (ø)
src/solutions/ode_solutions.jl	0.00% <0.00%> (ø)
src/solutions/rode_solutions.jl	0.00% <0.00%> (ø)

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