checks.adb (Check_Needed): New procedure...

2005-09-01  Robert Dewar  <dewar@adacore.com>

	* checks.adb (Check_Needed): New procedure, deals with removing checks
	based on analysis of short-circuited forms. Also generates warnings for
	improper use of non-short-circuited forms.
	Code clean ups.

From-SVN: r103857