PdbDumper: Added support for LF_ARGLIST
PdbDumper: Added support for LF_ARGLIST

BUG=
R=siggi@chromium.org

Review URL: https://codereview.chromium.org/1204353006.

google/syzygy,supriyantomaftuh/syzygy,google/syzygy,google/syzygy,supriyantomaftuh/syzygy,google/syzygy,supriyantomaftuh/syzygy,supriyantomaftuh/syzygy,Eloston/syzygy,Eloston/syzygy