2014-06-13  Robert Dewar  <dewar@adacore.com>

	* lib.ads, lib.adb, lib-writ.adb, lib-load.adb (Is_Compiler_Unit):
	Removed.
	* opt.ads (Compiler_Unit): New flag.
	* par-ch5.adb (Test_Statement_Required): Call Check_Compiler_Unit
	for null statement sequence (not allowed in compiler unit).
	* par-prag.adb (Prag): Handle Compiler_Unit[_Warning] during
	parsing.
	* restrict.ads, restrict.adb (Check_Compiler_Unit): New version and new
	calling sequence.
	* sem_ch11.adb, sem_ch3.adb, sem_ch4.adb: New calling sequence for
	Check_Compiler_Unit.
	* sem_ch6.adb (Analyze_Extended_Return_Statement): Call
	Check_Compiler_Unit (this construct is not allowed in compiler
	units).
	* sem_prag.adb (Analyze_Pragma, case Compiler_Unit[_Warning]):
	Set Opt.Compiler_Unit.

From-SVN: r211617