[DebugInfo] Sink DwarfDebug::addCurrentFnArgument down into DwarfFile.

Variable handling will be sunk into DwarfFile so that abstract variables
and the like can be shared across multiple CUs (to handle cross-CU
inlining, for example).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220453 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed