RFA: MN10300: Add redundant comparison elimination pass

[Nick Clifton]

Hi Jeff,

> I'd like to see us DTRT, otherwise I suspect this will get dropped on
> the floor.

OK, I'll do that.

> I'd look to catch add/sub and the logicals; anything beyond those
> probably isn't worth the headache.

Sure - I'll have a go at coding this now.

For the record I am attaching the latest version of the reorg version of 
the patch with fixes for all the other points raised by various reviewers.

Cheers
   Nick


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