Sporadic llvm-test-suite failures on HIP back-end

[KseniyaTikhomirova]

Observed two flaky failures with HIP only:

1. UNRESOLVED: SYCL :: Assert/assert_in_simultaneously_multiple_tus.cpp
   observed on two different patches:
   https://github.com/intel/llvm/runs/7919414936?check_suite_focus=true
   https://github.com/intel/llvm/runs/7972688959?check_suite_focus=true
   logs_48881.zip

2. FAIL: SYCL:: Basic/buffer/buffer_dev_to_dev.cpp -
   https://github.com/intel/llvm/runs/7951351745?check_suite_focus=true
   https://github.com/intel/llvm/actions/runs/2911608931/attempts/2
   logs_49028.zip

[KseniyaTikhomirova]

temporary disabling tests intel/llvm-test-suite#1173