Motivation for this change

New package: TVM, An End to End Deep Learning Compiler Stack for CPUs, GPUs and accelerators.

cc @imalsogreg @tkonolige

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux) <-- does this work on Darwin ATM? It didn't last time I checked.
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/) <-- None, shared headers and library only
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Result of a Nix build

$ ls -R result
result:
include  lib

result/include:
tvm

result/include/tvm:
runtime

result/include/tvm/runtime:
c_backend_api.h  container.h  data_type.h   memory.h  module.h	 object.h	registry.h    threading_backend.h
c_runtime_api.h  crt	      device_api.h  micro     ndarray.h  packed_func.h	serializer.h  vm

result/include/tvm/runtime/crt:
crt.h  error_codes.h  func_registry.h  graph_runtime.h	logging.h  memory.h  module.h  packed_func.h  platform.h  rpc_common  utvm_rpc_server.h

result/include/tvm/runtime/crt/rpc_common:
frame_buffer.h	framing.h  session.h  write_stream.h

result/include/tvm/runtime/micro:
standalone

result/include/tvm/runtime/micro/standalone:
utvm_runtime.h

result/include/tvm/runtime/vm:
bytecode.h  executable.h  memory_manager.h  vm.h

result/lib:
libtvm.dylib  libtvm_runtime.dylib