Have CommandObject::CheckRequirements() report the largest missing
requirement for a command instead of the smallest.  e.g. if a command
requires a Target, Process, Thread, and Frame, and none of those
are available, report the largest -- Target -- as being missing
instead of the smallest -- Frame.

Patch by Paul Osmialowski.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@218181 91177308-0d34-0410-b5e6-96231b3b80d8