patch to fix PR93564

[Andrew Stubbs]

On 26/02/2020 15:16, Andrew Stubbs wrote:
> The problem appears to be that the high-part of a register pair is not 
> marked as "ever live".  I'm trying to figure out whether this is some 
> kind of target-specific issue that has merely been exposed, but it's 
> difficult to see what's going on. I'm pretty sure I've never seen this 
> one before.

I'm now pretty sure your patch didn't cause this issue so much as expose it.

Either way, it's fixed now.

Andrew