ada: Fix spurious error on Ada 2022 declare expression of limited type

ada: Fix spurious error on Ada 2022 declare expression of limited type

The underlying problem is that declare expressions are implemented by means
of a temporary in most cases and that's incompatible with limited types.

gcc/ada/ChangeLog:

	* exp_ch4.adb (Expand_N_Expression_With_Actions): Create a temporary
	only for types that can be copied, and replace the EWA node by its
	expression for other types.
	* exp_ch6.adb (Expand_Ctrl_Function_Call): Bail out when the parent
	is an EWA node.
	* sem_ch3.adb (OK_For_Limited_Init_In_05): Recurse on the expression
	of an EWA node.