[llvm] [SimplifyCFG][JumpThreading] Don't duplicate inline-asm instructions (PR #71571)

[Nick Desaulniers via llvm-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

We've seen this in the Linux kernel before, pretty sure `\@` should be used on the label to make it unique per instantiation.  Let me see if I can find the kernel commit I'm thinking of.

https://github.com/llvm/llvm-project/pull/71571