https://github.com/fhahn commented:

> Changes generally LGTM though I think this should come with a release note so 
> users know about the new command line options and functionality?

Thanks, I tried to add release note entries for the new behavior + the new 
flags. Hope I added them in the right place.

> I don't see any issues with the code. I'd prefer if we has a 
> TYSan-instrumented bootstrap build of LLVM before we merge this, so we're 
> confident this doesn't cause any unexpected issues.

Just updated the tysan branches again. Unfortunately we aren't yet at a point 
where LLVM is `tysan` clean, there is a large number of reported violations 
when running the tblgen built with `tysan` even without this patch. I'd expect 
that a substantial amount of work is still needed to get to a state where we 
can build LLVM successfully with tysan.

What is feasible at the moment is building SingleSource and for that the patch 
doesn't add new regressions (there are ~20 tests failing with tysan out of 
~1800). Still building MultiSource, but some files take a huge amount of time 
to build with tysan :(

https://github.com/llvm/llvm-project/pull/76612
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