cyndyishida wrote:

> This PR temporarily turns off negative directory caching to fix the build 
> failures.

What does temporarily mean here? Is it until the project identified with errors 
can resolve themselves? Is it until error detection in the build system can 
catch cases where negative stating can cause incorrect build errors? Is it a 
pre-determined time frame? 

I'm concerned about disabling this optimization entirely without an 
understanding of how it will be turned back on. What is the added performance 
cost of doing this in environments where I/O accesses can be expensive? 

https://github.com/llvm/llvm-project/pull/134698
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