PR tree-optimization/87287
	* fold-const.c (fold_binary_loc) <case EQ_EXPR>: Move signed modulo
	X % C == 0 to X % (unsigned) C == 0 optimization to ...
	* match.pd (X % C == 0): ... here.  New optimization.

	* gcc.dg/tree-ssa/pr87287.c: New test.

From-SVN: r264260