We want to add some basic precommit CI for `libsycl`, similar to what we
have for `SPIR-V`.
Here it just builds `libsycl` and runs `check-sycl`, but only non-GPU
tests will be run because this job is run on GitHub-hosted runners which
don't have a GPU, so we will never run GPU tests in this CI job.
Postcommit already runs SYCL GPU tests.
We have runtime GPU detection as part of the `check-sycl` lit setup so
everything works fine.
Currently there is only one `check-sycl` test at all and it is a GPU
test, so `check-sycl` is basically a no op, so this is de-facto build
only.
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Signed-off-by: Nick Sarnie <nick.sarnie@intel.com>
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