[SYCL][HIP] Support lowerWGScope and fix hip event

[malixian]

Support lowerWGScope for AMDGPU and fix _pi_event::is_completed() function.

[malixian]

Any questions about this PR?

[kbobrovs]

LowerWGScope.cpp LGTM. Good to see enabling HIP is that simple.

Should corresponding tests from https://github.com/intel/llvm-test-suite/tree/intel/SYCL/HierPar
be enabled for HIP as well?

[malixian]

Should corresponding tests from https://github.com/intel/llvm-test-suite/tree/intel/SYCL/HierPar be enabled for HIP as well?

I test from SYCL-CTS/tests/h_item, handler and stream.

[kbobrovs]

I test from SYCL-CTS/tests/h_item, handler and stream.

OK. But llvm-test-suite/tree/intel/SYCL/HierPar should still pass - correct? If so, why not enable them?

[malixian]

OK. But llvm-test-suite/tree/intel/SYCL/HierPar should still pass - correct? If so, why not enable them?

Yes, it's a good case to test this feature. But I first encountered this problem in the sycl-cts benchmark.