https://github.com/Teemperor approved this pull request.

> We could perhaps come up with a lit mode that runs some tests in serial, but 
> this is a larger project than I want to get into now.

I believe we could use LIT's parallelism_group feature for this (see also 
#201870 ). We do (unfortunately) have several tests that spawn many threads if 
they end up running in parallel, then I can see how that can stall an 
overloaded builder. We could make a LIT parallelism_group for 'heavy' tests to 
avoid that.

Having said that, I also like to have a fast test suit runs and restricting 
parallelism is another step away from that.

In any case, LGTR as it improves the current situation. Bumping timeouts is 
IMHO always fine.

https://github.com/llvm/llvm-project/pull/210043
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