[Ada] unqualified debug variable for library-level package renaming

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on trunk

The special variable created to encode the gdb name for a package renaming
did not include the embedded name of the renamed package in the case of a
library-level renaming. This qualification was being done for renamings
nested within a unit, but not for entities associated with the auxiliary
declarations of a compilation unit. This showed up as a problem when
linking with shared libraries on IVMS (link conflict between library-level
renamings of DEC.Text_IO and Ada.Text_IO packages). The fix is to enter
the debug variable's declaration in the list of entities that will later
be qualified by Qualify_All_Entity_Names at the point where the library-level
package renaming is expanded.

No simple test is available.

2007-08-31  Gary Dismukes  <dismukes@adacore.com>

	* exp_ch8.adb (Expand_N_Package_Renaming_Declaration): In the case of a
	library-level package renaming, pass the declaration associated with
	the renaming's special debug variable to Qualify_Entity_Names to ensure
	that its encoded name is properly qualified.

	* exp_dbug.adb (Qualify_All_Entity_Names): Check for a variable entity
	occurring in the list of entities to qualify, and do not attempt to
	traverse an entity list in that case. Variables associated with
`	library-level package renamings can now occur in the table.

	* exp_dbug.ads: Revise documentation of the encoding for renaming
	declarations.

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