[PATCH 0/2] MR7004: Fixes for dbghelp.

[eric pouech (＠epo)]

This MR contains two fixes for dbghelp:
- one fixes incorrect error reporting in FPO unwinder from PDB files
  (esp. now properly reports the missing support of .raSearch keyword).
- the second lower memory usage in local variables / parameters
  (not an ideal solution, but has a positive impact on some test cases)