2016-04-20 Bob Duff <duff@adacore.com>

2016-04-20  Bob Duff  <duff@adacore.com>

	* sem_ch6.adb (Enter_Overloaded_Entity): Do not warn about
	hiding unless we're actually hiding something. The previous
	code would (for example) warn about a "<" on a record type
	because it incorrectly thought it was hiding the "<" on Boolean
	in Standard. We need to check that the homonym S is in fact a
	homograph of a predefined operator.

2016-04-20  Ed Schonberg  <schonberg@adacore.com>

	* exp_util.ads, exp_util.adb (Build_Procedure_Form): Moved here
	from exp_ch6.adb, for use in SPARK_To_C mode when creating the
	procedure equivalent to a function returning an array, when this
	construction is deferred to the freeze point of the function.
	* sem_util.adb (Is_Unchecked_Conversion_Instance): Include a
	function that renames an instance of Unchecked_Conversion.
	* freeze.adb (Freeze_Subprogram): Generate the proper procedure
	declaration for a function returning an array.
	* exp_ch6.adb (Build_Procedure_Form): Moved to exp_util.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@235266 138bc75d-0d04-0410-961f-82ee72b054a4