[Ada] Redesigned support for SCIL nodes

[Arnaud Charlet <charlet at adacore dot com>]

This patch does not add new functionality to the compiler. It is a new
implementation of the support for SCIL nodes that leaves the frontend
more clean because avoids computation searching for SCIL nodes to adjust
their fields when the referenced nodes are transformed by the expander.

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

2010-06-23  Javier Miranda  <miranda@adacore.com>

	* frontend.adb (Frontend): Add call to initialize the new package
	SCIL_LL.
	* exp_ch7.adb (Wrap_Transient_Expression): Remove call to
	Adjust_SCIL_Node.
	(Wrap_Transient_Statement): Remove call to Adjust_SCIL_Node.
	* sem_ch5.adb (Analyze_Iteration_Scheme.Process_Bounds): Remove call to
	Adjust_SCIL_Node.
	* exp_util.adb (Insert_Actions): Remove code for
	N_SCIL_Dispatch_Table_Object_Init and N_SCIL_Tag_Init nodes.
	(Remove_Side_Effects): Remove calls to Adjust_SCIL_Node.
	* sinfo.adb (SCIL_Entity, SCIL_Tag_Value): Remove checks on
	N_SCIL_Tag_Init and N_SCIL_Dispatch_Table_Object_Init in the assertion.
	(SCIL_Related_Node, Set_SCIL_Related_Node): Removed.
	* sinfo.ads (SCIL_Related_Node): Field removed.
	(N_SCIL_Dispatch_Table_Object_Init): Node removed.
	(N_SCIL_Tag_Init): Node removed.
	* sem_scil.ads, sem_scil.adb (Adjust_SCIL_Node): Removed.
	(Check_SCIL_Node): New implementation.
	(Find_SCIL_Node): Removed.
	* sem.adb (Analyze): Remove management of
	N_SCIL_Dispatch_Table_Object_Init and N_SCIL_Tag_Init nodes.
	* sem_util.adb (Insert_Explicit_Dereference): Remove call to
	Adjust_SCIL_Node.
	* exp_ch4.adb (Expand_N_In): Code cleanup: remove call to
	Set_SCIL_Related_Node and avoid adding the SCIL node before the
	referenced node using Insert_Action because this is not longer required.
	(Expand_Short_Circuit_Operator): Remove call to SCIL node.
	* exp_ch6.adb (Expand_Call): Remove call to Adjust_SCIL_Node.
	* sem_ch4.adb (Analyze_Type_Conversion): Remove call to Adjust_SCIL_Node
	* exp_disp.adb (Expand_Dispatching_Call): Minor code reorganization
	because we no longer require to generate the SCIL node before the call.
	(Make_DT): Remove generation of SCI_Dispatch_Table_Object_Init node.
	Remove calls to Set_SCIL_Related_Node and avoid adding the SCIL
	nodes before the referenced node using Insert_Action because this
	is not longer required.
	* atree.adb (Allocate_Initialize_Node, Replace, Rewrite): Add call to
	update the SCIL_Node field.
	* sprint.adb (Sprint_Node_Actual): Remove code for
	N_SCIL_Dispatch_Table_Object_Init and N_SCIL_Tag_Init nodes.
	* treepr.adb (Print_Node): Print the SCIL node field (if available).
	* exp_ch3.adb (Build_Init_Procedure): Remove generation of
	SCIL_Tag_Init nodes.
	* scil_ll.ads, scil_ll.adb: New files.
	* gcc-interface/Makefile.in, gcc-interface/Make-lang.in: Update
	dependencies.

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