* config/m68k/constraints.md: New.
	* config/m68k/m68k.h (REG_CLASS_FROM_LETTER,
	CONST_OK_FOR_LETTER_P, CONST_DOUBLE_OK_FOR_LETTER_P,
	EXTRA_CONSTRAINT): Remove.
	* config/m68k/m68k.md: Include constraints.md.
	* expr.c (expand_expr_real_1): Copy DECL_RTL before using it.

From-SVN: r124335