[ObjectYAML] First bit of support for encoding DWARF in MachO

This patch adds the starting support for encoding data from the MachO __DWARF segment. The first section supported is the __debug_str section because it is the simplest.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288774 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed