gdb

gdb
	* linux-tdep.c (linux_make_siginfo_note): New function.
	(linux_make_corefile_notes): Use it.
	* corelow.c (get_core_siginfo): New function.
	(core_xfer_partial) <TARGET_OBJECT_SIGNAL_INFO>: New case.
gdb/testsuite
	* gdb.base/siginfo-obj.exp: Create core file.  Test siginfo from
	core files, if possible.
	* gdb.base/siginfo-thread.c: New file
	* gdb.base/siginfo-thread.exp: New file
bfd
	* elf.c (elfcore_grok_note) <NT_SIGINFO>: New case; make
	pseudosection.