More conservative fix of casting of constants issue.
More conservative fix of casting of constants issue.


Former-commit-id: 8c08bbe292487ce0bbe51aaf51c2aec310e6754e
darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide