LTO: Replace split dwarf implementation that uses objcopy with one that uses direct emission.

Part of PR37466.

Differential Revision: https://reviews.llvm.org/D47091

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332884 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed