Grokdump: new shell command, "lm"

lm - list matching modules and details such as product version number
found in the minidump. Also, enabled a mode to execute one command and
exit.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/18310003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15410 ce2b1a6d-e550-0410-aec6-3dcde31c8c00