[m-dev.] diff: array.m: allow user to disable bounds checks

[Fergus Henderson]

Tyson Richard DOWD, you wrote:
> Fergus Henderson wrote:
> > 
> > library/array.m:
> > 	Put code for array bounds checking inside
> > 	`#ifndef ML_OMIT_ARRAY_BOUNDS_CHECKS', so that the user
> > 	can disable array bounds checking.
> 
> By any chance, do you know what the cost of the bounds checks were?

Well, it depends on your benchmark, of course -- but for the `diff'
benchmark, it was about 3%.

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