Some more simplification rules to fix recent performance regressions.
Some more simplification rules to fix recent performance regressions.


Former-commit-id: a589502b5486fb49b8b6d790e26eecc0b74e598d
Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide