[llvm] [llvm] Optimize print-on-crash serialization (PR #205682)

[Nikita Popov via llvm-commits]

nikic wrote:

Note that there's also further printing optimizations in the pipeline (https://github.com/llvm/llvm-project/pull/221460) which may further change the picture here.

If it's possible to close the gap here by further optimizing instruction printing, I think that's what we should focus on. That benefits more than just `-print-on-crash`.

https://github.com/llvm/llvm-project/pull/205682