[NFC][LiveDebugValues] Document how LiveDebugValues operates
authorJeremy Morse <jeremy.morse@sony.com>
Thu, 18 Jun 2020 09:54:09 +0000 (10:54 +0100)
committerJeremy Morse <jeremy.morse@sony.com>
Thu, 18 Jun 2020 09:54:09 +0000 (10:54 +0100)
commit3626eba11f2367da88ccb0280a34731243278034
treec837b701cae099a15b392c1b3e04d5527fac6db6
parent934bcaf10b57fc199d9b15722ea50f65a791ca4e
[NFC][LiveDebugValues] Document how LiveDebugValues operates

We're missing a plain English explanation of how this pass is supposed
to operate -- add one to the file comment.

Differential Revision: https://reviews.llvm.org/D80929
llvm/lib/CodeGen/LiveDebugValues.cpp