re PR tree-optimization/19899 (ICE: tree check: expected real_cst, have integer_cst in const_binop, at fold-const.c:1490 with -ftree-vectorize -msse2)

	PR tree-optimization/19899
	* Makefile.in (tree-scalar-evolution.o): Add real.h.
	* tree-scalar-evolution.c: Include real.h.
	(add_to_evolution): Build constant -1 of correct type.

	* gcc.dg/tree-ssa/scev-1.c: New test.
	* gcc.dg/tree-ssa/scev-2.c: New test.

From-SVN: r102695