[LSV] Use make_range, and reformat a DEBUG message. NFC

Summary:
The DEBUG message was hard to read because two Values were being printed
on the same line with only the delimiter "aliases".  This change makes
us print each Value on its own line.

Reviewers: asbirlea

Subscribers: llvm-commits, arsenm, mzolotukhin

Differential Revision: https://reviews.llvm.org/D22533

llvm-svn: 276055