[NFC] Initialize AtomicLoadExtActions array

[JaydeepChauhan14]

No description provided.

[nikic]

LGTM, though the loop below does end up initializing all elements as well.

[llvm-ci]

LLVM Buildbot has detected a new failure on builder intel-sycl-gpu running on intel-sycl-gpu-01 while building llvm at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/2426

Here is the relevant piece of the build log for the reference

Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: libomp :: worksharing/single/omp_single.c (95236 of 95246)
PASS: libomp :: worksharing/for/omp_for_collapse.c (95237 of 95246)
PASS: libomp :: tasking/issue-94260-1.cpp (95238 of 95246)
PASS: libomp :: worksharing/for/omp_collapse_many_GTGEGT_int.c (95239 of 95246)
PASS: libomp :: env/kmp_set_dispatch_buf.c (95240 of 95246)
PASS: libomp :: tasking/issue-69733.c (95241 of 95246)
PASS: libomp :: worksharing/for/omp_collapse_many_LTLEGE_int.c (95242 of 95246)
PASS: libomp :: tasking/hidden_helper_task/taskgroup.cpp (95243 of 95246)
PASS: libomp :: worksharing/for/omp_collapse_many_GELTGT_int.c (95244 of 95246)
PASS: libomp :: tasking/issue-94260-2.c (95245 of 95246)
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1510.704763