ada: Remove explicit decoration of wrapper created in freezing

ada: Remove explicit decoration of wrapper created in freezing

We create wrapper functions associated with inherited functions with
controlling results which are not overridden during freezing. We partly
decorated them explicitly, even though they would be fully decorated
later anyway.

This early decoration didn't work as expected, because flag
In_Private_Part that is read by Override_Dispatching_Operation it not
set reliably while freezing (as explained in the comment of
Is_Private_Declaration). In effect, we were getting a circularity
between Alias and Overridden_Operation, which was causing GNATprove to
loop infinitely.

Apparently the cleanest fix is to not decorate the wrapper with an early
call to Override_Dispatching_Operation.

gcc/ada/

	* exp_ch3.adb (Make_Controlling_Function_Wrappers): Remove early
	decoration.