Fix testSimple and testConst in stack_op_test (#3)
Fix testSimple and testConst in stack_op_test (#3)

* Fix testSimple and testConst in stack_op_test

* Create a specialisation of DoParallelConcatUpdate for SyclDevice and
register it

* Guard all code in TENSORFLOW_USE_SYCL

* Do not use sycl device for int32

* Registration of the Sycl version is now looking like the one for the GPU

* Remove added empty line

lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl,lukeiwanski/tensorflow-opencl