Eric Botcazou ea0f31d040 Ada: Fix stack corruption with concatenation and 'Image of composite type
The issue is that the expansion of 'Image for composite types is heavyweight
and involves a mix of Expression_With_Actions and controlled object that
does not work properly when it is the argument of a call to a subprogram,
so this replaces it by the canonical scheme used for controlled temporaries.

gcc/ada/
	PR ada/123832
	* exp_imgv.adb: Add with and use clauses for Exp_Ch7.
	(Expand_Image_Attribute): Establish a transient scope before
	rewriting the attribute as a call to Put_Image.
	(Expand_Wide_Image_Attribute): Likewise.
	(Expand_Wide_Wide_Image_Attribute): Likewise.
	* exp_put_image.ads (Build_Image_Call): Add note about the
	need for a transient scope when the function is invoked.
	* exp_put_image.adb (Build_Image_Call): Call Insert_Actions
	to immediately insert the actions instead of wrapping them
	in an Expression_With_Actions node.

gcc/testsuite/
	* gnat.dg/put_image2.adb: New test.
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