ada: Fix spurious error on anonymous array initialized by conditional expression

ada: Fix spurious error on anonymous array initialized by conditional expression

Even though the actual subtype of the anonymous array is not yet set on the
object itself by the time Insert_Conditional_Object_Declaration is called,
it is set on its initialization expression, so it can simply be forwarded
to Insert_Conditional_Object_Declaration from there, which avoids creating
a new one for each new object and triggering a subtype mismatch later.

gcc/ada/ChangeLog:

	* exp_ch4.adb (Insert_Conditional_Object_Declaration): Remove Decl
	formal parameter, add Typ and Const formal parameters.
	(Expand_N_Case_Expression): Fix pasto in comment.  Adjust call to
	Insert_Conditional_Object_Declaration and tidy up surrounding code.
	(Expand_N_If_Expression): Adjust couple of calls to
	Insert_Conditional_Object_Declaration.