2012-10-01 Yannick Moy <moy@adacore.com>

2012-10-01  Yannick Moy  <moy@adacore.com>

	* sem_ch13.adb (Add_Invariants): Analyze the invariant expression
	as an assertion expression.
	* sem_ch3.adb / sem_ch3.ads (Preanalyze_Assert_Expression):
	New procedure that wraps a call to Preanalyze_Spec_Expression
	for assertion expressions, so that In_Assertion_Expr can be
	properly adjusted.
	* sem_prag.adb (Analyze_PPC_In_Decl_Part
	Check_Precondition_Postcondition Preanalyze_CTC_Args): Call the
	new Preanalyze_Assert_Expression.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191898 138bc75d-0d04-0410-961f-82ee72b054a4