[PATCH 0/5] MR8225: PDB rewrite #15.

[eric pouech (＠epo)]

This MR does:
- improve startup time when loading a large PDB file
  (a chromium based PDB file (larger than 4G) now loads in 3,5s)
  (at the begining of this rewrite, loading the very same PDB file
   ended with a reboot triggered by the Linux OOM after 30 minutes
   of heavy swap)
- finally untie the new PDB backend for the old one (they are now
  considered as two independant debug formats, so that we can
  eventually drop the old one at some point)