0.8.0.2:

	Fix stack exhaustion stack exhaustion death
	... define DEFINE-FUNCTION-NAME-SYNTAX function-name-defining macro;
	... use it for SETF functions, and define LEGAL-FUNCTION-NAME-P
		and FUN-NAME-BLOCK-NAME in terms of VALID-FUNCTION-NAME-P;
	... also define internal PCL generalized function name syntax as
		such, and test for internalness in SET-ARG-INFO1;
	... OAOO bonus: delete bits of SB!PCL::CLASS-PREDICATE that were
		decorating the compiler;

	(note: this API is interface-compatible with CMUCL's for defining
	generalized function name syntax.  However, it's not currently exported
	from SB-EXT because I happen to think that calling something
	VALID-FUNCTION-NAME-P when it returns two values, the second of which
	is syntactically significant, is a bit lame, and maybe we'll be able
	to agree a better name between the two projects)