* pa/constraints.md: New file.
	* pa.md: Include constraints.md.
	* pa.c (cint_ok_for_move): Avoid using CONST_OK_FOR_LETTER_P.
	(integer_store_memory_operand, ldil_cint_p): New functions.
	* pa-protos.h (integer_store_memory_operand, ldil_cint_p): Declare.
	* pa.h (CONST_OK_FOR_LETTER_P, CONST_DOUBLE_OK_FOR_LETTER_P,
	IS_RELOADING_PSEUDO_P, EXTRA_CONSTRAINT): Remove.
	* pa32-regs.h (REG_CLASS_FROM_LETTER): Remove.
	* pa64-regs.h (REG_CLASS_FROM_LETTER): Remove.

From-SVN: r125157