Remove deprecated "cuda_xxx" APIs
Remove deprecated "cuda_xxx" APIs

These have been deprecated for ~3 years now; I think we should let them
go now.

(Side note: three variants of gpu_tile() in this file are marked as
“will be deprecated” — we should mark them as such if they really are)


Former-commit-id: abfa886ee13da0836bd306f6ec92fa845c4f82a7
darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,darkbuck/Halide