Use 16 bits to store an array reference index

[johnbcoughlin]

This seems to work without causing any extra errors, hopefully CI bears it out.

[chriselrod]

Thanks. I guess you've confirmed this fixes your problem locally?

If it's not too much trouble, mind adding a test?

Also, please feel free to bump the patch version so I can issue a new release after merging.

[codecov]

Codecov Report

Base: 86.16% // Head: 86.78% // Increases project coverage by +0.62% 🎉

Coverage data is based on head (1b404b2) compared to base (c74cd33).
Patch coverage: 75.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #451      +/-   ##
==========================================
+ Coverage   86.16%   86.78%   +0.62%     
==========================================
  Files          37       38       +1     
  Lines        9379     9390      +11     
==========================================
+ Hits         8081     8149      +68     
+ Misses       1298     1241      -57     

Impacted Files	Coverage Δ
src/condense_loopset.jl	96.44% <75.00%> (+1.18%)	⬆️
src/getconstindexes.jl	25.00% <0.00%> (-75.00%)	⬇️
src/LoopVectorization.jl	50.00% <0.00%> (-16.67%)	⬇️
src/simdfunctionals/mapreduce.jl	82.79% <0.00%> (-9.68%)	⬇️
src/codegen/lower_constant.jl	73.23% <0.00%> (-1.88%)	⬇️
src/reconstruct_loopset.jl	91.79% <0.00%> (-0.79%)	⬇️
src/precompile.jl	0.00% <0.00%> (ø)
src/codegen/lower_compute.jl	88.03% <0.00%> (+0.23%)	⬆️
src/codegen/lower_memory_common.jl	86.59% <0.00%> (+0.36%)	⬆️
src/codegen/lower_store.jl	88.00% <0.00%> (+0.44%)	⬆️
... and 14 more

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[johnbcoughlin]

Done. The new test fails on master with the same error. Let me know if you'd like me to test a more general property now that the 8 bit limit is raised.

[chriselrod]

Thanks, looks great!

[chriselrod]

Failures are unrelated to this PR.