Modify minidump_stackwalk to be more tolerant of overlapping ranges.
Modify minidump_stackwalk to be more tolerant of overlapping ranges.

These ranges can be seen in some Android minidumps.

BUG=chromium:439531
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/9744002

git-svn-id: 7939527bf0a06ad24ad020f729d5600cb42ed5d7@1412 4c0a9323-5329-0410-9bdc-e9ce6186880e

bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad,bittorrent/breakpad