Add "-k" and "-K" options to the driver, that allow you to register 
some commands that will get run if the target crashes.

Also fix the bug where the local .lldbinit file was not getting
sourced before not after the target was created from the file options on the
driver command line.

<rdar://problem/19019843>


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@222295 91177308-0d34-0410-b5e6-96231b3b80d8