checks.adb (Apply_Scalar_Range_Check): Implement Check_Float_Overflow.

checks.adb (Apply_Scalar_Range_Check): Implement Check_Float_Overflow.

2013-01-02  Robert Dewar  <dewar@adacore.com>

	* checks.adb (Apply_Scalar_Range_Check): Implement Check_Float_Overflow.
	* opt.ads, opt.adb: Handle flags Check_Float_Overflow[_Config].
	* par-prag.adb: Add dummy entry for pragma Check_Float_Overflow.
	* sem_prag.adb: Implement pragma Check_Float_Overflow.
	* snames.ads-tmpl: Add entries for pragma Check_Float_Overflow.
	* switch-c.adb: Recognize -gnateF switch.
	* tree_io.ads: Update ASIS version number.
	* gnat_rm.texi: Add documentation of pragma Check_Float_Overflow.

From-SVN: r194788