[binutils-gdb] Add support for extracting thread names from cores.

[sergiodj+buildbot at redhat dot com]

*** TEST RESULTS FOR COMMIT 4dfc5dbc4e1b267d440dd515a42fe6fd96a8d860 ***

Author: John Baldwin <jhb@FreeBSD.org>
Branch: master
Commit: 4dfc5dbc4e1b267d440dd515a42fe6fd96a8d860

Add support for extracting thread names from cores.

Add a new gdbarch method to extract a thread name from a core for a
given thread.  Use this new method in core_thread_name to implement the
to_thread_name target op.

gdb/ChangeLog:

	* corelow.c (core_thread_name): New function.
	(init_core_ops): Use "core_thread_name" for the "to_thread_name"
	target op.
	* gdbarch.sh (core_thread_name): New gdbarch callback.
	* gdbarch.h: Re-generate.
	* gdbarch.c: Re-generate.