[Ada] generate static dispatch for tagged types

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on trunk

Improve handling of tagged types, in particular to allow generation of
static dispatch tables, and avoid the generation of trampolines for
primitive operations.

This is a code reorganization, with no new features. All dispatching tests
from ACATS exercise these changes.

2008-03-26  Javier Miranda  <miranda@adacore.com>

	* exp_disp.adb (Make_DT, Make_Secondary_DT): Set attribute
	Is_Static_Dispatch_Table
	(Build_Dispatch_Tables): Replace calls to Exchange_Entities() by calls
	to Exchange_Declarations to exchange the private and full-view. Bug
	found working in this issue.
	(Expand_Dispatching_Call): Propagate the convention of the subprogram
	to the subprogram pointer type.
	(Make_Secondary_DT): Replace generation of Prim'Address by
	Address (Prim'Unrestricted_Access)
	(Make_DT): Replace generation of Prim'Address by
	Address (Prim'Unrestricted_Access)
	(Make_Disp_*_Bodies): When compiling for a restricted profile, use
	simple call form for single entry.
	(Make_DT): Handle new contents of Access_Disp_Table (access to dispatch
	tables of predefined primitives).
	(Make_Secondary_DT): Add support to handle access to dispatch tables of
	predefined primitives.
	(Make_Tags): Add entities to Access_Dispatch_Table associated with
	access to dispatch tables containing predefined primitives.

	* exp_ch6.adb (N_Pragma): Chars field removed, use Chars
	(Pragma_Identifier (..  instead, adjustments throughout to accomodate
	this change.
	(Register_Predefined_DT_Entry): Updated to handle the new contents
	of attribute Access_Disp_Table (pointers to dispatch tables containing
	predefined primitives).

	* exp_util.ads, exp_util.adb (Corresponding_Runtime_Package): New
	subprogram.
	(Find_Interface_ADT): Updated to skip the new contents of attribute
	Access_Dispatch_Table (pointers to dispatch tables containing predefined
	primitives).

	* sem_util.adb (Has_Abstract_Interfaces): Add missing support for
	concurrent types.
	(Set_Convention): Use new function Is_Access_Subprogram_Type
	(Collect_Interfaces_Info): Updated to skip the new contents of attribute
	Access_Dispatch_Table (pointers to dispatch tables containing predefined
	primitives).

	* exp_atag.ads, exp_atag.adb (Build_Inherit_Predefined_Prims): Improve
	expanded code avoiding calls to Build_Predef_Prims.
	(Build_Set_Predefined_Prim_Op_Address): Improve expanded code avoiding
	call to Build_Get_Predefined_Prim_Op_Address.

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