[spv-out] Cache constant composites

[evahop]

Updates cached_constants to include composites.

[codecov-commenter]

Codecov Report

Merging #2257 (7970d1a) into master (dce689c) will decrease coverage by 0.24%.
The diff coverage is 52.94%.

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@@            Coverage Diff             @@
##           master    #2257      +/-   ##
==========================================
- Coverage   82.25%   82.02%   -0.24%     
==========================================
  Files          80       80              
  Lines       42946    43161     +215     
==========================================
+ Hits        35325    35401      +76     
- Misses       7621     7760     +139     

Impacted Files	Coverage Δ
src/front/wgsl/parse/mod.rs	88.28% <27.27%> (-7.79%)	⬇️
src/back/glsl/mod.rs	86.12% <100.00%> (+0.29%)	⬆️
src/back/hlsl/writer.rs	91.19% <100.00%> (ø)
src/back/spv/block.rs	91.23% <100.00%> (-0.13%)	⬇️
src/back/spv/mod.rs	95.19% <100.00%> (+0.02%)	⬆️
src/back/spv/writer.rs	96.70% <100.00%> (+0.06%)	⬆️

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[teoxoy]

This looks great! Thanks!