They are used by helper shaders, the intention is avoiding needing to recompile the shaders (from GLSL to SPIR-V) if the bindings changes on the translated guest shaders
You'll only really see the benefit here with threaded-gal or parallel shader cache compile.
Fix shaderc multithreaded changes
Thread safety for shaderc Options constructor
Dunno how they managed to make a constructor not thread safe, but you do you. May avoid some freezes.
