[Ada] More front end entity flags, new functions Nkind_In

[Arnaud Charlet <charlet at adacore dot com>]

Tested on i686-linux, committed on trunk

This patch adds 17 more flags to the flags available in entities
for use in einfo, and also 7 and 8 argument versions of Nkind_In.
This is all internal stuff with no visible external consequences
so no test program needed.

This patch also adds the Nkind_In convenience functions to make the code
more readable.

Also some code clean ups, such as removing no longer used functions
in Atree.

2007-12-13  Robert Dewar  <dewar@adacore.com>

	atree.ads, atree.adb (Flag231..Flag247): New functions
	(Set_Flag231..Set_Flag247): New procedures
	(Basic_Set_Convention): Rename Set_Convention to be
	Basic_Set_Convention
	(Nkind_In): New functions
	Remove Atree.Delete_Tree/Delete_Node and Nlist.Delete_List

	* exp_ch6.adb (Expand_Call): Use new flag Has_Pragma_Inline_Always
	instead
	 of obsolete function Is_Always_Inlined
	(Register_Predefined_DT_Entry): Initialize slots of the second
	secondary dispatch table.
	Remove Atree.Delete_Tree/Delete_Node and Nlist.Delete_List
	(Expand_N_Function_Call): Remove special provision for stack checking.

	* exp_util.ads, exp_util.adb (Is_Predefined_Dispatching_Operation):
	Include _Disp_Requeue in the list of predefined operations.
	(Find_Interface_ADT): Modified to fulfill the new specification.
	Remove Atree.Delete_Tree/Delete_Node and Nlist.Delete_List

	* par-ch4.adb, nlists.ads, nlists.adb: 
	Remove Atree.Delete_Tree/Delete_Node and Nlist.Delete_List

	* sinfo.ads, sinfo.adb: (Nkind_In): New functions
	Fix location of flag for unrecognized pragma message

	* sem_ch7.adb: Use Nkind_In

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