Refactor sycl header file

[mmeterel]

Description

This PR is refactoring sycl header file by using sycl/sycl.hpp whenever it is available, like in hipSYCL case.

For DPC++ and LLVM, we will start using sycl/sycl.hpp whenever it becomes available.

This PR is fixing #193 and partially fixing #198

Checklist

All Submissions

• Do all unit tests pass locally?
  Tested the below combinations

gen9, mklcpu, mklgpu: blas: all pass
gen9: mklcpu, mklgpu: lapack: I see errors which are not related to this PR. They also exist in develop.
gen9: mklcpu, mklgpu: rng: all pass

nvidia, mklcpu, cublas: blas: all pass
nvidia, mklcpu, cusolver: lapack: all pass
nvidia, mklcpu, curand: rng: all pass

with hipSYCL:
amd, mklcpu, rocblas: blas: all pass
amd, mklcpu, rocrand: rng: all pass except 4 tests. These failures are due to ROCM version. Will be fixed in ROCM 5.1.

• Have you formatted the code using clang-format?

[mmeterel]

linux_dpcpp_gen9_blas.log
linux_dpcpp_gen9_lapack.log
linux_dpcpp_gen9_rng.log
linux_hipsycl_amd_blas.log
linux_hipsycl_amd_rng.log
linux_llvm_nvidia_blas.log
linux_llvm_nvidia_lapack.log
linux_llvm_nvidia_rng.log

[andrewtbarker]

Looks good. Are there plans for DPC++ to change to sycl/sycl.hpp? Is that part of some SYCL standard?

Minor: did the formatting changes come from clang-format? Is there some version change in clang-format that led to these changes?

[sknepper]

LGTM as well! Thanks!

[mmeterel]

Looks good. Are there plans for DPC++ to change to sycl/sycl.hpp? Is that part of some SYCL standard?

Minor: did the formatting changes come from clang-format? Is there some version change in clang-format that led to these changes?

Yes, DPCPP will move to sycl/sycl.hpp as well. It is part of SYCL spec. LLVM compiler already has sycl/sycl.hpp, but it simply points to CL/sycl.hpp.

[mkrainiuk]

Looks good to me, thank you!

[mmeterel]

Looks good. Are there plans for DPC++ to change to sycl/sycl.hpp? Is that part of some SYCL standard?
Minor: did the formatting changes come from clang-format? Is there some version change in clang-format that led to these changes?

Yes, DPCPP will move to sycl/sycl.hpp as well. It is part of SYCL spec. LLVM compiler already has sycl/sycl.hpp, but it simply points to CL/sycl.hpp.

AFAIK, no change in clang-format version. My guess is, those files were not following clang-format initially.