RFC/RFA: Fix bug with REE optimization corrupting extended registers

[Bernd Schmidt]

On 11/19/2015 06:06 PM, Jeff Law wrote:

> Frankly, the overall structure of ree is a mess -- I've found it
> incredibly difficult to follow every time I've had to look at it.

Yeah, no kidding. The check seems to be in the wrong place - it's done 
very late when we're replacing things, and IMO we should just restrict 
the candidates for optimization much earlier.

Also, I want to apply the following. Ok if testing succeeds?


Bernd
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