Only load records that are listed in global hash file when handling
the global symbol stream.
Do the same thing for the public symbols.

When using MS linker in incremental mode:
- old variable definitions are kept in the (DBI) global symbol stream
  along side the new definition
- but only the latest (valid) definition is referenced from the hash
  table
Signed-off-by: Eric Pouech <eric.pouech@gmail.com>