* rs6000-core.c (rs6000coff_core_p): Don't check the core file

	* rs6000-core.c (rs6000coff_core_p):  Don't check the core file
	size for full core dumps. Copy core file header to private data.
	(rs6000coff_core_file_failing_command,
	rs6000coff_core_file_failing_signal):  New functions to extract
	the file name and terminating signal from the core file.
	* coff-rs6000.c:  Use them.