Web: Generalize _EXTENSIONS* in SPIR-V back-end.
About 50 fewer #ifdefs. About 14K smaller. Note, the base size is ill-defined due to optimizer settings (size vs. performance), compression, and target architecture. Some recent %'s are accidentally reported as 3X the real savings. Early %'s were accurate. What matters though is that each step got worthwhile gains, and what the final size ends up being.
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