DebugInfo: Move loclist base address from DwarfFile to DebugLocStream

There's no need to have more than one of these (there can be two
DwarfFiles - one for the .o, one for the .dwo - but only one loc/loclist
section (either in the .o or the .dwo) & certainly one per
DebugLocStream, which is currently singular in DwarfDebug)

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed