[Ada] New pragma/aspect Remote_Access_Type

[Arnaud Charlet <charlet at adacore dot com>]

This change introduces a new implementation defined pragma, and an associated
implementation defined aspect: Remote_Access_Type. This pragma allows the
definition of generic units allowing RACWs as actuals for generic formal
access types.

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

2012-01-30  Thomas Quinot  <quinot@adacore.com>

	* gnat_rm.texi, sem_dist.adb, sem_dist.ads, einfo.ads, sem_prag.adb,
	sem_ch12.adb, sem_attr.adb, aspects.adb, aspects.ads, par-prag.adb,
	sem_cat.adb, snames.ads-tmpl (Sem_Dist.Is_Valid_Remote_Object_Type):
	New subprogram (extracted from
	Sem_Cat.Validate_Remote_Access_Object_Type_Declaration).
	(Einfo.Is_Remote_Types): Now applies to generic types. Update
	documentation accordingly.
	(Sem_Ch12.Analyze_Associations): A RACW type is acceptable as
	actual for a formal type to which a pragma Remote_Access_Type
	applies.
	(Aspects, Par.Prag, Sem_Prag): Support for new pramga/aspect
	Remote_Access_Type.
	(Sem_Attr.Analyze_Attribute, case Stub_Type): Attribute can
	be applied to a generic type if pragma Remote_Access_Type
	applies, in which case the type of the attribute is
	System.Partition_Interface.RACW_Stub_Type.

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