PR python/18565 - make Frame.function work for inline frames

PR python/18565 - make Frame.function work for inline frames

PR python/18565 notes that calling frame filters don't work properly for
inlined functions.  This happens because Frame.function on an inline
frame will yield the wrong result.  This patch changes this code to use
find_frame_funname instead, which handles inline frames properly.

Built and regtested on x86-64 Fedora 24.

2016-08-03  Tom Tromey  <tom@tromey.com>

	PR python/18565:
	* python/py-frame.c (frapy_function): Use find_frame_funname.

2016-08-03  Tom Tromey  <tom@tromey.com>

	PR python/18565:
	* gdb.python/py-frame-inline.exp: Add Frame.function test.