ada: Compile-time simplification of 'Image incorrectly ignores Put_Image

In the case of Some_Enumeration_Type'Image (<some static value>),
the compiler will replace this expression in its internal program
representation with a corresponding string literal. This is incorrect
if the Put_Image aspect has been specified (directly or via inheritance)
for the enumeration type.

gcc/ada/

	* sem_attr.adb
	(Eval_Attribute): Don't simplify 'Image call if Put_Image has been
	specified.