gcc/
	* gensupport.h (compute_test_codes): Declare.
	* gensupport.c (compute_predicate_codes): Rename to...
	(compute_test_codes): ...this.  Generalize error message.
	(process_define_predicate): Update accordingly.
	* genpreds.c (compute_maybe_allows): Delete.
	(add_constraint): Use compute_test_codes to determine whether
	something can accept a SUBREG, REG or MEM.

From-SVN: r223687