Previously we would just forward the cleanup and create a normal "destroy"
cleanup resulting in early deallocation and use after frees along error paths.
As part of this I also had to tweak how DI recognizes self init writebacks to
not use SILLocations. This is approach is more robust (since we aren't relying
on SourceLocs/have verifiers to make sure we don't violate SIL) and also avoids
issues from the write back store not necessarily have the same SILLocation.
<rdar://problem/59830255>
