[dsymutil] Add relocation of compile_units low_pc/high_pc.

They need to be handled specifically as they could vary pretty
widely depending on how the linker moves functions around.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232192 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed