[llvm] [CodeLayout] cache-directed sort: limit max chain size (PR #69039)

[via llvm-commits]

spupyrev wrote:

> It makes sense to set a limit. I was just curious what would be the perf. gain that we drop if we set it to 128. (Any ideas @spupyrev ?)

I'll try to measure perf impact over the next couple of days and report here

https://github.com/llvm/llvm-project/pull/69039