Fix another incorrectly lifted let
Fix another incorrectly lifted let

Can't move a let that defines the size of shared memory inwards


Former-commit-id: 2c5b45d57221c5ec8169409a36edf4063e0b3348
darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide