[llvm] Default aarch64-min-jump-table-entries to 9 (PR #98391)

[via llvm-commits]

hiraditya wrote:

> What do you mean by "weren't significantly better", and do you have a reason to change this to 9?

Based on the comment here: https://github.com/llvm/llvm-project/pull/71166#issuecomment-1810505765

13 is too large IMO, it results in codesize increase and it seems it was purely chosen for benchmarking purposes. Is there a way to find a better number here?

https://github.com/llvm/llvm-project/pull/98391