* config/mips/mips-protos.h (function_arg_boundary): Declare.
	* config/mips/mips.h (PARM_BOUNDARY): Simplify definition.
	(STACK_BOUNDARY, MIPS_STACK_ALIGN): Likewise.
	(FUNCTION_ARG_BOUNDARY): Use new function_arg_boundary function.
	* config/mips/mips.c (function_arg_boundary): New function.
	Impose a maximum alignment of STACK_BOUNDARY.

From-SVN: r91370