* elf-bfd.h (elfcore_write_s390_tdb): Add prototype.
	* elf.c (elfcore_write_s390_tdb): New function.
	(elfcore_write_register_note): Call it.
	(elfcore_grok_s390_tdb): New function.
	(elfcore_grok_note): Call it.

	* readelf.c (get_note_type): Add NT_S390_TDB.
* spawn.cc (child_info_spawn::worker): Save and restore my_wr_proc_pipe around
non-execing operations to avoid handle leak seen in
http://cygwin.com/ml/cygwin/2013-03/msg00152.html .
* cygtls.h (_cygtls::signal_debugger): Change argument type.
(_cygtls::copy_context): Delete declaration.
* exceptions.cc (exception::handle): Don't call copy_context() here.  Move
signal_handler call earlier and always call it.
(_cygtls::copy_context): Delete definition.
(_cygtls::signal_debugger): Move copy_context logic here.  Suspend thread
receiving signal before gathering context information.
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