exp_fixd.adb (Integer_Literal): Add optional argument to construct a negative literal

exp_fixd.adb (Integer_Literal): Add optional argument to construct a negative literal

2007-04-20  Geert Bosch  <bosch@adacore.com>

	* exp_fixd.adb (Integer_Literal): Add optional argument to construct a
	negative literal
	(Do_Divide_Fixed_Fixed): Add comments to indicate Frac is always
	positive
	(Do_Divide_Fixed_Universal): Handle case of negative Frac.
	(Do_Multiply_Fixed_Fixed): Add coments to indicate Frac is always
	positive
	(Do_Multiply_Fixed_Universal): Handle case of negative Frac.

From-SVN: r125404