[LLVMdev] Modeling 16-bit pointer registers for an 8-bit target

[Sanjiv.Gupta at microchip.com]

> 
> I don't think there is code in Legalizer to expand GlobalAddress. But
you
> can custom lower it. X86 custom lower GlobalAddress nodes for a
different
> reason.
> 
> Evan
> 

Hmmm...That means we have to make i16 as a legal type (since
GlobalAddresses are 16-bits) and custom lower all 16-bit operations to
8-bit operations. I was thinking to take advantage of the already
present ExpandOp infrastructure.

-Sanjiv