* config/bfin/bfin.h (LEGITIMATE_CONSTANT_P): Call
	bfin_legitimate_constant_p.
	* config/bfin/bfin.md (movsi expander): Check return value of
	expand_mvoe.
	* config/bfin/bfin-protos.h (bfin_legitimate_constant_p): Declare.
	(expand_move): Adjust prototype.
	* config/bfin/bfin.c (expand_move): Now returns bool.  Handle
	invalid constants specially.
	(bfin_cannot_force_const_mem, bfin_legitimate_constant_p): New
	functions.
	(TARGET_CANNOT_FORCE_CONST_MEM): New macro.

From-SVN: r119011