[m-dev.] for review: better debugging of llds instructions

[Fergus Henderson]

Zoltan Somogyi, you wrote:
> 
> dupelim:
> 	Preserve the comments attached to labels, for debugging purposes.
> 
> llds_out:
> 	Add a predicate that displays an instruction and its comment for
> 	debugging. (Previously, you could only print the instruction
> 	for debugging.)
> 
> opt_debug:
> 	Print comments on instructions if --auto-comments is given.

That looks fine.

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