[DebugInfo] Add DwarfDebug& to DwarfFile.

Use the DwarfDebug in one function that previously took it as a
parameter, and lay the foundation for use this for other operations
coming soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220452 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed