bugs fixed simplify int32(float + float constant)
bugs fixed simplify int32(float + float constant)


Former-commit-id: 4be0b5eadd64de315578254cf4ecdafbb391593e
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide