ada: Fix crash in quantified expression expansion

ada: Fix crash in quantified expression expansion

Before this patch, the compiler failed to handle the case where the for loop
created by expansion of a quantified expression required cleanup handlers.

gcc/ada/

	* sem_ch5.adb (Analyze_Loop_Parameter_Specification): Fix test for
	expanded quantified expression context.
	(Is_Expanded_Quantified_Expr): New function.