Expose the PDB hash function. The hash function used in the named streams table of a PDB file is also used to generate the "public symbols" stream. This CL moves the hash function out of the anonymous namespace of pdb_util.cc so that it can be used to generate a "public symbols" stream. BUG= [email protected], [email protected], [email protected] Review URL: https://codereview.appspot.com/115370043 git-svn-id: http://sawbuck.googlecode.com/svn/trunk@2204 15e8cca8-e42c-11de-a347-f34a4f72eb7d