ada: Avoid dependency on Long_Long_Long_Integer and System.Img_LLLI for 'Image

When the Image attribute is applied directly to another attribute returning
Universal_Integer, for example Enum_Rep, it is converted to the equivalent
of Universal_Integer'Image, which is implemented by Long_Long_Long_Integer
and thus triggers a dependency on System.Img_LLLI, both being unnecessary
in most practical cases.

gcc/ada/ChangeLog:

	* exp_imgv.adb (Rewrite_Object_Image): When the prefix is a type
	conversion to Universal_Integer, use its expression directly. When
	the prefix is an integer literal with Universal_Integer type, try
	to compute a narrower type.

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