[clang] [clang][modules] Allow specifying thread-safe module cache (PR #179510)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/225/builds/1876

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'libomp :: ompt/parallel/nested.c' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp   -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src  -fno-omit-frame-pointer -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp -lm -latomic && /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp | tee /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp.out | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -fno-omit-frame-pointer -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp -lm -latomic
# .---command stderr------------
# | In file included from /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c:8:
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/callback.h:224:2: warning: "Clang 5.0 and later add an additional wrapper for outlined functions when compiling with debug information." [-W#warnings]
# |   224 | #warning                                                                       \
# |       |  ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/callback.h:226:2: warning: "Please define -DDEBUG iff you manually pass in -g to make the tests succeed!" [-W#warnings]
# |   226 | #warning                                                                       \
# |       |  ^
# | 2 warnings generated.
# `-----------------------------
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp
# .---command stderr------------
# | OMP: Info #276: omp_set_nested routine deprecated, please use omp_set_max_active_levels instead.
# `-----------------------------
# executed command: tee /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp.out
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c
# RUN: at line 3
/home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp   -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src  -fno-omit-frame-pointer -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp -lm -latomic && /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp | sort -n -s | tee /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp.out | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck --check-prefix=THREADS /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/clang -fopenmp -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test -L /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/src -fno-omit-frame-pointer -I /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c -o /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp -lm -latomic
# .---command stderr------------
# | In file included from /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c:8:
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/callback.h:224:2: warning: "Clang 5.0 and later add an additional wrapper for outlined functions when compiling with debug information." [-W#warnings]
# |   224 | #warning                                                                       \
# |       |  ^
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/callback.h:226:2: warning: "Please define -DDEBUG iff you manually pass in -g to make the tests succeed!" [-W#warnings]
# |   226 | #warning                                                                       \
# |       |  ^
# | 2 warnings generated.
# `-----------------------------
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp
# .---command stderr------------
# | OMP: Info #276: omp_set_nested routine deprecated, please use omp_set_max_active_levels instead.
# `-----------------------------
# executed command: sort -n -s
# executed command: tee /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/runtimes/runtimes-bins/openmp/runtime/test/ompt/parallel/Output/nested.c.tmp.out
# executed command: /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/build/./bin/FileCheck --check-prefix=THREADS /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c
# .---command stderr------------
# | /home/test-user/llvm-buildbot-worker/intel-sycl-gpu/llvm-project/openmp/runtime/test/ompt/parallel/nested.c:138:14: error: THREADS: expected string not found in input
# |  // THREADS: {{^}}[[THREAD_ID]]: ompt_event_barrier_implicit_parallel_end: parallel_id={{[0-f]+}}, task_id=[[IMPLICIT_TASK_ID]]
# |              ^
# | <stdin>:84:110: note: scanning from here
# | 562949953421313: ompt_event_barrier_implicit_parallel_begin: parallel_id=1000000000005, task_id=2000000000002, codeptr_ra=(nil)
...

```

</details>

https://github.com/llvm/llvm-project/pull/179510