DiscardEvents/invalid_event test sporadically fails on accelerator on OpenCL BE

[vmaksimo]

Failure log:

******************** TEST 'SYCL :: DiscardEvents/invalid_event.cpp' FAILED ********************
Script:
--
: 'RUN: at line 3';    /__w//llvm.obj/bin/clang++      -fsycl -fsycl-targets=spir64 /__w//llvm-test-suite/SYCL/DiscardEvents/invalid_event.cpp -o /__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out
: 'RUN: at line 5';   env SYCL_DEVICE_FILTER=host  /__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out
: 'RUN: at line 6';   env SYCL_DEVICE_FILTER=cpu,host  /__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out
: 'RUN: at line 7';    env SYCL_DEVICE_FILTER=opencl:gpu,host  /__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out
: 'RUN: at line 8';    env SYCL_DEVICE_FILTER=acc  /__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out
--
Exit Code: -11
Command Output (stdout):
--
$ ":" "RUN: at line 3"
note: command had no output on stdout or stderr
$ "/__w//llvm.obj/bin/clang++" "-fsycl" "-fsycl-targets=spir64" "/__w//llvm-test-suite/SYCL/DiscardEvents/invalid_event.cpp" "-o" "/__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out"
note: command had no output on stdout or stderr
$ ":" "RUN: at line 5"
note: command had no output on stdout or stderr
$ "env" "SYCL_DEVICE_FILTER=host" "/__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out"
# command output:
The test passed.

$ ":" "RUN: at line 6"
note: command had no output on stdout or stderr
$ "env" "SYCL_DEVICE_FILTER=cpu,host" "/__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out"
# command output:
The test passed.

$ ":" "RUN: at line 7"
note: command had no output on stdout or stderr
$ "env" "SYCL_DEVICE_FILTER=opencl:gpu,host" "/__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out"
# command output:
The test passed.

$ ":" "RUN: at line 8"
note: command had no output on stdout or stderr
$ "env" "SYCL_DEVICE_FILTER=acc" "/__w//build/SYCL/DiscardEvents/Output/invalid_event.cpp.tmp.out"
note: command had no output on stdout or stderr
error: command failed with exit status: -11

The issue has been detected in #5180, #5183, #5175

[AlexeySachkov]

Test was re-enabled in #9426