[Ada] Compiler crash with -gnatR2 and with of child

[Pierre-Marie de Rodat]

This patch fixes a bug where if a parent library package contains a with
clause that mentions a child of that same parent package, then gnat can
crash if the parent package is compiled with the -gnatR2 switch.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* repinfo.adb (List_Entities): The code was assuming that if we
	encounter a package in the current scope, then it must be
	a (physically) nested package.  That was wrong, because it could
	be a child package.  Avoid recursing into child packages; they
	have not been annotated with representation information, and
	-gnatR2 queries that information.
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