ada: Implement conversions from Big_Integer to large types

This implements the conversion from Big_Integer to Long_Long_Unsigned on
32-bit platforms and to Long_Long_Long_{Integer,Unsigned} on 64-bit ones.

gcc/ada/

	* libgnat/s-genbig.ads (From_Bignum): New overloaded declarations.
	* libgnat/s-genbig.adb (LLLI): New subtype.
	(LLLI_Is_128): New boolean constant.
	(From_Bignum): Change the return type of the signed implementation
	to Long_Long_Long_Integer and add support for the case where its
	size is 128 bits.  Add a wrapper around it for Long_Long_Integer.
	Add an unsigned implementation returning Unsigned_128 and a wrapper
	around it for Unsigned_64.
	(To_Bignum): Test LLLI_Is_128 instead of its size.
	(To_String.Image): Add qualification to calls to From_Bignum.
	* libgnat/a-nbnbin.adb (To_Big_Integer): Likewise.
	(Signed_Conversions.From_Big_Integer): Likewise.
	(Unsigned_Conversions): Likewise.

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