[llvm] [libsycl] implement methods of synchronization in event and queue classes (PR #205860)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `intel-sycl-gpu` running on `intel-sycl-gpu-01` while building `libsycl` at step 7 "test-build-unified-tree-check-sycl".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/12590

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-sycl) failure: test (failure)
******************** TEST 'libsycl :: basic/parallel_for_indexers.cpp' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/bin/clang++ -Werror  -fsycl -Wno-error=deprecated-declarations /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/libsycl/test/basic/Output/parallel_for_indexers.cpp.tmp.out
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/bin/clang++ -Werror -fsycl -Wno-error=deprecated-declarations /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/libsycl/test/basic/Output/parallel_for_indexers.cpp.tmp.out
# .---command stderr------------
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:34:16: error: no member named 'cout' in namespace 'std'; did you mean 'count'?
# |    34 |           std::cout << "line: " << __LINE__ << " Data[" << i << "] is "
# |       |                ^~~~
# |       |                count
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_algo.h:4072:5: note: 'count' declared here
# |  4072 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
# |       |     ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:34:11: error: reference to overloaded function could not be resolved; did you mean to call it?
# |    34 |           std::cout << "line: " << __LINE__ << " Data[" << i << "] is "
# |       |           ^~~~~~~~~
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_algo.h:4072:5: note: possible target for call
# |  4072 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
# |       |     ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:35:71: error: no member named 'endl' in namespace 'std'; did you mean 'end'?
# |    35 |                     << Data[i] << " expected " << ExpectedVal << std::endl;
# |       |                                                                       ^~~~
# |       |                                                                       end
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/initializer_list:99:5: note: 'end' declared here
# |    99 |     end(initializer_list<_Tp> __ils) noexcept
# |       |     ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:69:16: error: no member named 'cout' in namespace 'std'; did you mean 'count'?
# |    69 |           std::cout << "line: " << __LINE__ << " Data[" << i << "] is {"
# |       |                ^~~~
# |       |                count
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_algo.h:4072:5: note: 'count' declared here
# |  4072 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
# |       |     ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:69:11: error: reference to overloaded function could not be resolved; did you mean to call it?
# |    69 |           std::cout << "line: " << __LINE__ << " Data[" << i << "] is {"
# |       |           ^~~~~~~~~
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/stl_algo.h:4072:5: note: possible target for call
# |  4072 |     count(_InputIterator __first, _InputIterator __last, const _Tp& __value)
# |       |     ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/libsycl/test/basic/parallel_for_indexers.cpp:72:29: error: no member named 'endl' in namespace 'std'; did you mean 'end'?
# |    72 |                     << std::endl;
# |       |                             ^~~~
# |       |                             end
# | /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/initializer_list:99:5: note: 'end' declared here
# |    99 |     end(initializer_list<_Tp> __ils) noexcept
# |       |     ^
# | 6 errors generated.
...

```

</details>

https://github.com/llvm/llvm-project/pull/205860