[Crash-utility] mm_struct for exiting tasks

Hello, I'm Justin Vreeland, I'm currently and intern at Cray working with the OS/Kernel group. We use crash frequently to track down various problems and sometimes we need to get information about tasks that were exiting when the dump was taken. Because the mm_struct has been removed from the task struct. Crash doesn't let you use vtop or vm to do this so I added a way to specify mm_struct (with -M) for tasks whose stats is 'Exiting'. Currently it's a bit hackish it modifies the tasks status and context to pass all the checks, and then restores both before returning. If this is something you're interested in it I'd be happy to bring it up to snuff. Modifications are attached. -- -Justin