[ESIMD] Enable the test imulh_umulh.cpp

[v-klochkov]

The test was disabled due to false-alarm. The cases/PRs reporting this test as 'unrelated fail' used old compiler with new test.

All such PRs had CI runs with the test failed at compilation.

Even though both the PR and LIT tests were merged at same hour, the compiled used by CI was still old, but the test was new. PR: intel/llvm#8176
PR-LIT: #1566

Signed-off-by: Vyacheslav N Klochkov [email protected]

[v-klochkov]

@bader - IMO, it was a false-alarm. After some additional investigation the test doesn't seem flaky.
There were 4 PRs complaining about this test fail as unrelated. In those PRs CI reported compilation error

In those cases when the test fails it says:

/__w/llvm/llvm/toolchain/bin/../include/sycl/ext/intel/experimental/esimd/math.hpp:424:12: error: no matching function for call to '__esimd_umulh'
    return __esimd_umulh(Src0.data(), Src1.data());
           ^~~~~~~~~~~~~

That tells me that the new test was tested with old compiler because the call of__esimd_umulh at line 424
was done in old compiler: https://github.com/intel/llvm/pull/8176/files#diff-26ef7db7487d5ee7f82b57f6a4c5a4e20e82786e94a19c1b0d4cba460f94924bL424

[v-klochkov]

Fails on 2 tests are unrelated to this PR:
SYCL :: OneapiDeviceSelector/case_sensitivity.cpp
SYCL :: Reduction/reduction_ctor.cpp