[pdb] Round-trip module & file info to/from YAML.

This implements support for writing compiland and compiland source
file info to a binary PDB.  This is tested by adding support for
dumping these fields from an existing PDB to yaml, reading them
back in, and dumping them again and verifying the values are as
expected.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@276426 91177308-0d34-0410-b5e6-96231b3b80d8
15 files changed