[SYCL] Use scheduler in queue shortcuts to avoid waiting for deps

[KseniyaTikhomirova]

Some queue shortcuts attempt to bypass the scheduler to avoid the
overhead of creating a command node. In cases where dependencies
couldn't be passed to the backend directly, there was a blocking wait
during submission.

This patch changes that behavior to bypass the scheduler only if all
dependency events can be used directly: host task dependencies have been
completed, others have been enqueued and there are no cross-context
dependencies.

[mfrancepillois]

Sycl-Graph LGTM

[sergey-semenov]

@aelovikov-intel Could you please have another look?

[aelovikov-intel]

Stylistically it's good, the comments are very helpful as well.

I've reviewed the logic to the best of my abilities/knowledge in the area but the latter is very limited and I might have missed something. That said, you're the expert in the area and I don't know if anybody available could help with the review, so let's merge it.

[sergey-semenov]

Last commit was a comment typo fix, merging based on the previous test run.

[martygrant]

@KseniyaTikhomirova @sergey-semenov there is a post-commit failure for this PR which should be addressed, as the error has occurred in a more recent PR. The errors are:

/Users/runner/work/llvm/llvm/src/sycl/source/detail/queue_impl.hpp:747:64: error: unused parameter 'Type' [-Werror,-Wunused-parameter] void finalizeHandler(HandlerType &Handler, const CG::CGTYPE &Type,

/__w/llvm/llvm/src/sycl/source/detail/queue_impl.cpp:325:24: error: lambda capture 'Context' is not used [-Werror,-Wunused-lambda-capture] 325 | [&Context, &CheckEvent](const sycl::event &Event) {

[sergey-semenov]

@martygrant Thanks for letting me know, opened #12523

[aelovikov-intel]

It seems there are remaining warnings caused by this (https://github.com/intel/llvm/actions/runs/7701911776/job/20989034380):

/__w/llvm/llvm/src/sycl/unittests/scheduler/InOrderQueueHostTaskDeps.cpp:94:7: error: 'unique_lock' may not intend to support class template argument deduction [-Werror,-Wctad-maybe-unsupported]
   94 |       std::unique_lock lk(CvMutex);
      |       ^

[sergey-semenov]

Opened #12539