OSV-2022-525 Heap-buffer-overflow in spvtools::CFA<spvtools::val::BasicBlock>::CalculateDominators

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=48553 Crash type: Heap-buffer-overflow READ 8 Crash state: spvtools::CFA::CalculateDominators spvtools::val::PerformCfgChecks spvtools::val::ValidateBinaryUsingContextAndValidationState...