sem_res.adb (Resolve_Call): In the part of the code where it is deciding whether...

sem_res.adb (Resolve_Call): In the part of the code where it is deciding whether to turn the call into an...

2017-01-23  Bob Duff  <duff@adacore.com>

	* sem_res.adb (Resolve_Call): In the part of the code where
	it is deciding whether to turn the call into an indexed
	component, avoid doing so if the call is to an instance of
	Unchecked_Conversion. Otherwise, the compiler turns it into an
	indexed component, and resolution of that turns it back into a
	function call, and so on, resulting in infinite recursion.
	* sem_util.adb (Needs_One_Actual): If the first formal has a
	default, then return False.

From-SVN: r244774