[llvm] [KeyInstr] MDNodeKeyImpl<DILocation> skip zero values for hash (PR #143357)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

> Interesting! What I find peculiar is how big the difference between stage1-O0-g and stage2-O0-g is. It seems like Clang is doing something extremely terrible here compared to GCC, and it would be nice to find out what that is and whether we can fix it...

Yeah, the difference is quite extreme. I've put that on my wishlist to look at if/when I get a quiet day, if no one beats me to it.

Thanks for the review

https://github.com/llvm/llvm-project/pull/143357