[PATCH 1/2] Negative numbers added for sreal class.

[PATCH 1/2] Negative numbers added for sreal class.

	* predict.c (propagate_freq): More elegant sreal API is used.
	(estimate_bb_frequencies): Precomputed constants replaced by integer
	constants.
	* sreal.c (sreal::normalize): New function.
	(sreal::to_int): Likewise.
	(sreal::operator+): Likewise.
	(sreal::operator-): Likewise.
	(sreal::signedless_plus): Likewise.
	(sreal::signedless_minus): Likewise.
	(sreal::operator/): Negative number support is added.
	* sreal.h: Definition of new functions added.
	(inline sreal operator<<): New function.
	(inline sreal operator>>): Likewise.

From-SVN: r218008