This serie mainly: - fix remaining code quality warnings, - move creation of symt inside new PDB reader; it doesn't change (yet) the old logic of creating all symbolic information at debug info init.
-- v2: dbghelp: Create all symt* from new PDB reader. dbghelp: Build compiland table for new PDB reader. dbghelp: Beef up reading compiland header helper. dbghelp: Load global symbols from DBI. dbghelp: Return method_result from pdb_reader_request_cv_typeid. dbghelp: Get rid of code quality warning.