Add two additional DNBLog's in places where we're about to kill
off the inferior process so we stand a better chance of understanding
what caused us to send a PT_KILL.
<rdar://problem/12720340> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@177817 91177308-0d34-0410-b5e6-96231b3b80d8