[Ada] Generation of external and fully qualified names

[Arnaud Charlet <charlet at adacore dot com>]

This patch corrects a buffer issue which may lead to bogus expanded names at
link time. The problem is initiated while creating the external name of a
tagged type whose scope is an overloaded name. This places useless data in the
Homonym_Numbers buffer which is then reused when building the qualified name
of an arbitrary entity.

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

2011-12-02  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_dbug.adb: Comment reformatting.
	(Get_External_Name): Use Reset_Buffers to reset the contents of
	Name_Buffer and Homonym_Numbers.
	(Qualify_All_Entity_Names): Reset the contents of Name_Buffer and
	Homonym_Numbers before creating a new qualified name for a particular
	entity.
	(Reset_Buffers): New routine.

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