Use appropriate calling conventions for PTX functions and kernels.

[maleadt]

PTX_Kernel	PTX_Kernel - Call to a PTX kernel. Passes all arguments in parameter space.
PTX_Device	PTX_Device - Call to a PTX device function. Passes all arguments in register or parameter space.

[maleadt]

This seems LLVM 8 (i.e. Julia 1.4) only though.

[codecov]

Codecov Report

Merging #17 into master will decrease coverage by 3.97%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   72.14%   68.16%   -3.98%     
==========================================
  Files          18       18              
  Lines        1156     1087      -69     
==========================================
- Hits          834      741      -93     
- Misses        322      346      +24     

Impacted Files	Coverage Δ
src/ptx.jl	88.07% <100.00%> (-0.32%)	⬇️
src/gcn.jl	0.00% <0.00%> (-30.65%)	⬇️
src/interface.jl	38.46% <0.00%> (-22.26%)	⬇️
src/irgen.jl	76.53% <0.00%> (-12.00%)	⬇️
src/debug.jl	91.30% <0.00%> (-0.37%)	⬇️
src/optim.jl	98.43% <0.00%> (-0.10%)	⬇️
src/cache.jl	0.00% <0.00%> (ø)
src/mcgen.jl	100.00% <0.00%> (ø)
src/execution.jl	0.00% <0.00%> (ø)
... and 7 more

---

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[maleadt]

Bumping Julia to 1.4 here.