xtensa.c (function_arg_advance): Check for args that must be passed in the stack.

xtensa.c (function_arg_advance): Check for args that must be passed in the stack.

	* config/xtensa/xtensa.c (function_arg_advance): Check for args
	that must be passed in the stack.
	(xtensa_gimplify_va_arg_expr): Skip special-case padding for small
	arguments if the size is not a constant.

From-SVN: r84708