spv/lower + cfgssa speedups (useful when loading massive SPIR-V samples).#35

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eddyb wants to merge 2 commits intoeddyb/var-iofrom

eddyb/cfgssa-speedups

Commits on Apr 20, 2026

spv/lower: directly use entry block defs, bypassing `cfgssa` explicit propagation.
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cfgssa: use a second level of sparseness (akin to 2-level tries).
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