Use ScopedPrinter in llvm-pdbdump

When printing raw PDB file fields, streams, and records, use the
ScopedPrinter class so we have consistency with llvm-readobj's output
format.

For the most part this is pretty mechanical, but I had to fix up the test
file to conform to the new YAMLesque output format. i added a few
additional helper functions to the ScopedPrinter such as one to print a
dotted version, etc.

Differential Revision: http://reviews.llvm.org/D19897
Reviewed By: rnk

llvm-svn: 268506