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

[Rahman Lavaee via llvm-commits]

rlavaee wrote:

Can you share perf. improvement numbers to compare with results in https://github.com/llvm/llvm-project/pull/68638?

BTW, I have a local patch to improve performance for larger chains (based on my speculation https://reviews.llvm.org/D152834#inline-1500317). If this can wait for a while, I will try to send a PR in one week.

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