convert LLDBSwigPythonCallTypeScript to ArgInfo::max_positional_args

This patch converts another user of ArgInfo::count over to
use ArgInfo::max_positional_args instead.   I also add a test
to make sure both documented signatures for python type formatters

Reviewers: JDevlieghere, clayborg, labath, jingham

Reviewed By: labath

Subscribers: lldb-commits

Tags: #lldb

Differential Revision:

git-svn-id: 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed