[PATCH] [llgo] cmd/llgoi: use line editor

[Andrew Wilkins]

In http://reviews.llvm.org/D9811#174002, @pcc wrote:

> Thanks for working on this much-needed usability improvement.
>
> I played around with your change locally, and it seems to break one of the tests (`llgoi/panic.test`).


Fixed. Prompt() doesn't return the newline, so we need to add one.


http://reviews.llvm.org/D9811

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