[PATCH] D22008: GlobalISel: implement low-level type suitable for MachineInstr selection

[Tim Northover via llvm-commits]

> The bottom line is, this is for a smoother transition from SDISel to GISel than actually needed for GISel.

I can certainly live with it as a temporary hack like that, I'll start
adding it. But I think we should be *very* careful about extending its
use or we will just end up with a messy 2-location type system.

Tim.