[clang] [llvm] [Instrumentation] Move out to Utils (NFC) (PR #108532)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-s390x-linux` running on `systemz-1` while building `clang,llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/42/builds/1089

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVMFuzzer-Unittest :: ./Fuzzer-s390x-Test/29/42' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/lib/fuzzer/tests/./Fuzzer-s390x-Test-LLVMFuzzer-Unittest-2693756-29-42.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=42 GTEST_SHARD_INDEX=29 /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/lib/fuzzer/tests/./Fuzzer-s390x-Test
--

Note: This is test shard 30 of 42.
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from Corpus
[ RUN      ] Corpus.Distribution

--
exit: -11
--
shard JSON output does not exist: /home/uweigand/sandbox/buildbot/clang-s390x-linux/stage1/runtimes/runtimes-bins/compiler-rt/lib/fuzzer/tests/./Fuzzer-s390x-Test-LLVMFuzzer-Unittest-2693756-29-42.json
********************


```

</details>

https://github.com/llvm/llvm-project/pull/108532