PR ada/51483
	* cstand.adb (Register_Float_Type): Add 'precision' parameter and use
	it to set the RM size.  Use directly 'size' for the Esize.
	(Create_Back_End_Float_Types): Adjust call to above.
	* get_targ.ads (Register_Type_Proc): Add 'precision' parameter.
	* set_targ.ads (FPT_Mode_Entry): Add 'precision' component.
	(Write_Target_Dependent_Values): Adjust comment.
	* set_targ.adb (Register_Float_Type): Add 'precision' parameter and
	deal with it.
	(Write_Target_Dependent_Values): Write the precision in lieu of size.
	(Initialization): Read the precision in lieu of size and compute the
	size from the precision and the alignment.
	* gcc-interface/gigi.h (enumerate_modes): Add integer parameter.
	* gcc-interface/misc.c (enumerate_modes): Likewise.  Do not register
	types for vector modes, pass the size in addition to the precision.

From-SVN: r208546