RX: 4.5 branch: Fix alignment and addressing issues.

[Nick Clifton]

Hi Richard,

> Do you really need peepholes for this?  I would have thought that
> merely adding the instruction patterns for this would have been
> enough to encourage combine to do its job merging these patterns...

I thought so too, but I found in my tests that combine was missing 
plenty of cases where the optimization could take place.  Hence I added 
the peepholes.  (I admit that I did not delve deeply into *why* combine 
was not using my instruction pattens, I just found that the peepholes 
worked).  Plus I reasoned that the peepholes could not hurt...

Cheers
   Nick