[PATCH 0/5] MR950: Improvements in dbghelp support for global/static variables.

[eric pouech (＠epo)]

This series includes several improvements in DbgHelp for supporting
(global / file static / function static) variables.

In more details:
- correct distinction and hierarchy attributes for the three kinds
  (Dwarf and PDB)
- better filtering of PDB information
  + dropping invalid variable definitions from incremental linker
    (hence preventing their use instead of the valid ones)
  + keeping more wanted variables in case of collision (by address
    or by name)