* expmed.c (expand_mult): Force operand to register before computing
	cost.
	* i386.c (x86_decompose_lea): New global vairable.
	* i386.h (x86_decompose_lea): Declare.
	(TARGET_DECOMPOSE_LEA): New macro.
	(RTX_COST): Handle leas properly.

From-SVN: r46823