sem_ch11.adb (Analyze_Raise_xxx_Error): do not mark such nodes as not in ALFA.

sem_ch11.adb (Analyze_Raise_xxx_Error): do not mark such nodes as not in ALFA.

2011-08-03  Yannick Moy  <moy@adacore.com>

	* sem_ch11.adb (Analyze_Raise_xxx_Error): do not mark such nodes as not
	in ALFA. Instead, they are considered as assertions to prove.
	* sem_ch4.adb (Analyze_Conditional_Expression): do not always mark such
	nodes as not in ALFA. Instead, include conditional expressions in ALFA
	if they have no ELSE part, or if they occur in pre- and postconditions,
	where the Condition cannot have side-effects in ALFA
	(Analyze_Membership_Op): do not mark such nodes as not in ALFA
	(Analyze_Type_Conversion): do not always mark such nodes as not in ALFA.
	Instead, include type conversion between scalar types in ALFA.
	* sem_ch6.adb (Process_Formals): correctly mark a parameter in ALFA
	if-and-only-if its type is in ALFA.

From-SVN: r177285