Crash when baking with Enlighten on a system with more than 64 threads, for example a AMD Threadripper 3990X.

Steps to reproduce:
Open gfx tests project.
Open scene 'Assets/044-BakedLightingLightmapMats-editor.unity'
Choose Enlighten as bake backend.
Bake lighting.

Observed result:
100% reproducible crash in the embree worker threads spawned by Enlighten:
> Unity.exe!embree::PrimRefGen<embree::HeuristicBinning<2>,embree::atomic_set<embree::PrimRefBlock> >::task_gen_parallel(const embree::TaskScheduler::ThreadInfo & thread, unsigned __int64 idx) Line 80 C++
Unity.exe!embree::TaskSchedulerStandard::run(unsigned __int64 tid) Line 100 C++
Unity.exe!embree::TaskSchedulerStandard::threadFunction(embree::TaskSchedulerStandard::Thread * thread) Line 115 C++
Unity.exe!embree::threadStartup(embree::ThreadStartupData * parg) Line 120 C++
[External Code]

Exception thrown: read access violation.
**block* was 0xFFFFFFFFFFFF7FFF.

Thread was spawned by BakingJobs.Worker 0
[External Code]
Unity.exe!embree::ConditionSys::wait(embree::MutexSys & mutex) Line 109
Unity.exe!embree::TaskSchedulerStandard::stop() Line 74
Unity.exe!embree::BVH4Builder<embree::HeuristicBinning<2> >::BVH4Builder<embree::HeuristicBinning<2> >(const embree::TriangleType & trity, const std::basic_string<char,std::char_traits<char>,std::allocator<char> > & intTy, const embree::BuildTriangle triangles, unsigned __int64 numTriangles, const embree::Vec3<float> * vertices, unsigned __int64 numVertices, const embree::BBox<embree::Vec3<float> > & bounds, bool freeVertices) Line 37
Unity.exe!Geo::GeoEmbreeContext::Create(const Geo::IRtMesh * world, bool anyHitTraversal) Line 138
Unity.exe!Enlighten::Precalc::Create(const Enlighten::Bake * bake, const Enlighten::BakeInputProperties * props, const Enlighten::BakeVisibilityBuffer * visBuffer, const Enlighten::BakeInputSystem * system, const Enlighten::BakeSystemResource * systemResource, const Enlighten::IBakeTextureManager * texMgr) Line 58
Unity.exe!Enlighten::ComputeVisibility(Enlighten::BakeVisibilityBuffer * visBuffer, const Enlighten::Bake * bake, const Enlighten::BakeInputSystem * system, const Enlighten::BakeSystemResource * systemResource, const Geo::GeoArray<Geo::GeoPair<int,Enlighten::BakeInputLight const > > lightsToAdd, const Enlighten::IBakeTextureManager * pTexMgr, const Enlighten::BakeInputProperties * props, bool target) Line 989
Unity.exe!Enlighten::Bake::UpdateVisibilityBuffer(const Enlighten::IBakeInputSystem * pSystem, const Enlighten::IBakeSystemResource * pSystemResource, const Enlighten::IBakeTextureManager * pTexMgr, const Enlighten::IBakeInputLighting * pLighting, const Enlighten::IBakeInputProperties * pProps, bool target, Geo::IGeoProgressProxy * progress, Enlighten::IBakeVisibilityBuffer * & ioVisBuffer) Line 400
Unity.exe!CreateEnlightenBakeVisibilityBufferJob::Execute(IQueueJob::JobInfo & info) Line 139
Unity.exe!IQueueJob::InvokeExecuteJob(IQueueJob & job, IQueueJob::JobInfo * info) Line 45
Unity.exe!JobManager::UpdateFunction(void * userData) Line 583
Unity.exe!JobQueue::ExecuteJobFunc<1>(JobInfo * info, JobGroup * group, void()(void ) completeJobFunc) Line 460
Unity.exe!JobQueue::Exec(JobInfo * info, __int64 tag, int count, bool zeroJobWorkersMode) Line 617
Unity.exe!JobQueue::Steal(JobGroup * group, JobInfo * info, __int64 tag, int count, bool exec, bool zeroJobWorkersMode) Line 724
Unity.exe!JobQueue::ExecuteJobFromQueue(bool zeroJobWorkersMode) Line 819
Unity.exe!JobQueue::ProcessJobs(JobQueue::ThreadInfo * threadInfo, void * profInfo) Line 939
Unity.exe!JobQueue::WorkLoop(void * data) Line 1022
Unity.exe!Thread::RunThreadWrapper(void * ptr) Line 78
[External Code]

Expected outcome: bake completes without errors.

Workaround:
If SMT is disabled on an AMD Threadripper 3990X so it has 64 threads instead of 128, the crash doesn't happen.