Port DebugInfoPDB over to using llvm::Error.

Differential Revision: http://reviews.llvm.org/D19940
Reviewed By: rnk

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@268791 91177308-0d34-0410-b5e6-96231b3b80d8
37 files changed