Added performance test for new fusion operator.
Added performance test for new fusion operator.


Former-commit-id: 46543b4c633e124adb51cdef03640b374aabcb3f
Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide