Revert "[DWARF] Extract indexing code into a separate class hierarchy"

This reverts commit r332719 due to breaking this green dragon build:
http://green.lab.llvm.org/green/job/lldb-xcode/6644

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@332730 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed