OSV-2022-1119 Container-overflow in spvtools::opt::blockmergeutil::CanMergeWithSuccessor

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=52863 Crash type: Container-overflow READ 8 Crash state: spvtools::opt::blockmergeutil::CanMergeWithSuccessor std::1::function::funcspvtools::opt::BlockMergePass::Process spvtools::opt::IRContext::ProcessCallTreeFromRoots...