* simplify-rtx.c (simplify_binary_operation) <UDIV, DIV, UMOD, MOD>:
	Remove fall throughs.  Convert 0/x and 0%x into x&0 when x has
	side-effects.  Don't convert x/1.0 into x if we honor signaling NaNs.
	Convert x/-1.0 into -x if we don't honor signaling NaNs.  Convert
	x/-1 into -x.  Optimize x%1 into x&0 if x has side-effects.  Optimize
	x%-1 into 0 (or x&0 if x has side-effects).

From-SVN: r80625