[yaml2obj][obj2yaml] - Add support for dumping/parsing .dynamic sections.

This teaches the tools to parse and dump
the .dynamic section and its dynamic tags.

Differential revision: https://reviews.llvm.org/D57691

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353606 91177308-0d34-0410-b5e6-96231b3b80d8
19 files changed