Upstream bool vectors support for SYCL

[Fznamznon]

We added support of ext_vector_type attribute for boolean type SYCL language:

commit 1b8c0089ad79ee4765051ddfc722abc31d3ddac9
Author: Alexey Voronov <alexey.voronov@intel.com>
Date:   Wed Mar 20 15:50:15 2019 +0300

    [SYCL] Enable ext_vector_type of boolean type for SYCL language.

    Signed-off-by: Vladimir Lazarev <vladimir.lazarev@intel.com>
    Signed-off-by: Alexey Voronov <alexey.voronov@intel.com>

Without it, compilation of SYCL headers fails with error:

lib/clang/10.0.0/include/CL/sycl/detail/boolean.hpp:53:48: error: invalid vector element type 'cl::sycl::detail::Boolean::element_type' (aka 'bool')
  using DataType = element_type __attribute__((ext_vector_type(N)));