[llvm] [SandboxIR] Preserve the order of switch cases after revert. (PR #115577)

[Jorge Gorbe Moya via llvm-commits]

slackito wrote:

> Could please add a SandBoxIR label to https://github.com/llvm/llvm-project/blob/main/.github/new-prs-labeler.yml

Sure, I'll send you a separate PR. Thanks for pointing it out.

https://github.com/llvm/llvm-project/pull/115577