[ESIMD] Temporarily disable the flaky test imulh_umulh.cpp (#1591)

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

Author: v-klochkov

SYCL/ESIMD/imulh_umulh.cpp

@@ -10,6 +10,9 @@
 // RUN: %clangxx -fsycl %s -o %t.out
 // RUN: %GPU_RUN_PLACEHOLDER %t.out
 
+// TODO: the test gives irregular fails in CI (flaky), disabled until resolved.
+// XFAIL: *
+
 // The test verifies ESIMD API that multiplies 2 32-bit integer scalars/vectors
 // resulting into 64-bit result and returning the result as 2 parts:
 // lower 32-bits in the input modified operand and upper 32-bits as return