[Ada] Implement Pragma Partition_Elaboration_Policy

[Arnaud Charlet <charlet at adacore dot com>]

Initial work to implement pragma Partition_Elaboration_Policy. Currently,
only consistency is checked, the runtime only implements one policy.
A following patch will add a pragma Partition_Elaboration_Policy in the
runtime to enforce the policy (when tasking is used).

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

2012-10-29  Tristan Gingold  <gingold@adacore.com>

	* lib-writ.adb (Write_ALI): Emit partition elaboration policy
	in P line.
	* lib-writ.ads: Document partition elaboration policy indication.
	* sem_prag.adb (Check_Arg_Is_Partition_Elaboration_Policy): New
	procedure.
	(Analyze_Pragma): Handle Partition_Elaboration_Policy.
	(Sig_Flags): Add flag for Pragma_Partition_Elaboration_Policy
	* ali.adb (Initialize_ALI): Init Partition_Elaboration_Policy_Specified.
	(Scan_ALI): Read Ex indications.
	* ali.ads: ALIs_Record: Add Partition_Elaboration_Policy.
	* par-prag.adb (Prag): Add Partition_Elaboration_Policy.
	* snames.adb-tmpl (Is_Partition_Elaboration_Policy_Name): New function.
	* opt.ads (Partition_Elaboration_Policy): Declare.
	(Partition_Elaboration_Policy_Sloc): Declare.
	* bcheck.adb (Check_Consistent_Partition_Elaboration_Policy):
	New procedure.	(Check_Configuration_Consistency): Check partition
	elaboration policy consistency.
	* snames.ads-tmpl (Name_Partition_Elaboration_Policy): New name.
	(First_Partition_Elaboration_Policy_Name, Name_Concurrent,
	Name_Sequential, Last_Partition_Elaboration_Policy_Name): Likewise.
	(Pragma_Partition_Elaboration_Policy): New literal.
	(Is_Partition_Elaboration_Policy_Name): New function.

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