commit 05b08ac160 ("Reduce manual reference counting in
py-inferior.c") introduced a use-after-move bug in add_thread_object,
causing a test suite failure. This patch fixes the bug.
Tested on x86-64 Fedora 29.
gdb/ChangeLog
2019-07-11 Tom Tromey <tromey@adacore.com>
* python/py-inferior.c (add_thread_object): Don't use thread_obj
after it has been moved.