Make packed_planar_fusion performance test less flaky
Make packed_planar_fusion performance test less flaky


Former-commit-id: c7bc32e58b861e6a8346b883fa338a8d746266b2
Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide