[llvm] Fix MachineOutliner::createPrinterPass. (PR #115787)

[Sriraman Tallam via llvm-commits]

tmsri wrote:

> description is inaccurate: MachineOutliner is a ModulePass that just happens to work on MIR instead of IR, but we don't have a way to denote that. and ideally we'd have a MIR module printer pass, rather than relying on the MIR function printer pass, but I suppose this is good enough
> 
> (sorry I thought I hit "comment" earlier)

@shenhanc78 can you please fix the description?

https://github.com/llvm/llvm-project/pull/115787