DebugInfo: Group member variable along with the rest

Committed in r309498 I didn't spot where the rest of the private members
were in DWARFContext at the time - group them up again.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309506 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed