[binutils-gdb] Test user-defined gdb commands and arguments stack

[sergiodj+buildbot at sergiodj dot net]

*** TEST RESULTS FOR COMMIT ec835369f121c11d6e9484ed8c6c11097ad545c5 ***

Author: Pedro Alves <palves@redhat.com>
Branch: master
Commit: ec835369f121c11d6e9484ed8c6c11097ad545c5

Test user-defined gdb commands and arguments stack

We're missing a test that makes sure that arguments to user-defined
commands are handled correctly when a user-defined command calls
another user-defined command / recurses.

The following patch changes that code, so add such a test first so we
can be confident won't be breaking this use case.

gdb/testsuite/ChangeLog:
2016-12-02  Pedro Alves  <palves@redhat.com>

	* gdb.base/commands.exp (user_defined_command_args_stack_test):
	New procedure.
	(top level): Call it.