This is a boring mechanical update to support DPValues that look like
dbg.declares in SelectionDAG.
The tests will become "live" once #74090 lands (see for more info).
Split from D151795. I'm not sure it's conclusive, but these are all the related
tests I could find easily.
Reviewed By: MaskRay
Differential Revision: https://reviews.llvm.org/D152719