[llvm] [JITLink] Use `rsplit` on `-sectcreate` argument in llvm-jitlink (PR #115511)

[via llvm-commits]

dgg5503 wrote:

It seems no reviewers were added automatically and I am unable to add reviewers to this PR myself.

Given this is modifying code directly mentioned in https://github.com/llvm/llvm-project/commit/54b014b3f76e1c0060bd129e1196b6c729cb30b0, I am writing this comment to notify @lhames directly for visibility. May you please review this change or add the appropriate reviewers (if you can) to this PR when you have the chance? Thank you.

https://github.com/llvm/llvm-project/pull/115511