[m-dev.] for review: constant propagation

[Fergus Henderson]

Thomas Charles CONWAY, you wrote:
> 
> For review - a change to the compiler that adds constant propagation.
> I've been using this change for some time on hydra, and its impact on
> compile time isn't noticable, and for some programs, it can lead to
> a healthy speed increase.

That change looks fine.

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