predicates.md (nonimmed_operand, [...]): Use constantpool_mem_p.

predicates.md (nonimmed_operand, [...]): Use constantpool_mem_p.

	* config/xtensa/predicates.md (nonimmed_operand, mem_operand): Use
	constantpool_mem_p.
	(constantpool_operand): New.
	(move_operand): Disallow sub-word modes for the constant pool.
	* config/xtensa/xtensa.c (TARGET_SECONDARY_RELOAD): Define.
	(xtensa_secondary_reload_class): Replace with....
	(xtensa_secondary_reload): this function.  Remove SIGN_EXTEND check.
	Set icode for sub-word reloads from the constant pool.
	* config/xtensa/xtensa.h (SECONDARY_INPUT_RELOAD_CLASS): Delete.
	(SECONDARY_OUTPUT_RELOAD_CLASS): Delete.
	* config/xtensa/xtensa.md (reload<mode>_literal): New.
	* config/xtensa/xtensa-protos.h: Update prototypes.

From-SVN: r140036