call.c (conditional_conversion): Don't build BASE_CONVs for conversions between things that have the same type.

	* call.c (conditional_conversion): Don't build BASE_CONVs for
	conversions between things that have the same type.
	(build_conditional_expr): Tweak.
	(convert_like): Some BASE_CONVs really do require the generation
	of code.

	* init.c (perform_member_init): Don't go through build_modify_expr
	for simple initializations.

From-SVN: r28310