2011-08-29  Yannick Moy  <moy@adacore.com>

	* sem_ch3.adb (Array_Type_Declaration): Create declarations for Itypes
	created in Alfa mode, instead of inserting artificial declarations of
	non-Itypes in the tree.
	* sem_util.adb, sem_util.ads (Itype_Has_Declaration): New function to
	know if an Itype has a corresponding declaration, as defined in
	itypes.ads.

2011-08-29  Yannick Moy  <moy@adacore.com>

	* gnat1drv.adb: Minor rewrite.

2011-08-29  Bob Duff  <duff@adacore.com>

	* s-tasuti.adb (Make_Passive): Work around race condition in
	Make_Independent, which can cause Wait_Count to be zero. So instead of
	asserting that Wait_Count > 0, and then decrementing it, decrement it
	only if Wait_Count > 0.
	* s-taskin.ads (Wait_Count, Alive_Count, Awake_Count): All of these
	should be nonnegative, so declare them Natural instead of Integer.

From-SVN: r178240