[clang-tools-extra] [clang-tidy][NFC] Fix miscellaneous clang-tidy warnings over codebase (PR #164096)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-multistage` running on `ppc64le-clang-multistage-test` while building `clang-tools-extra` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/76/builds/13236

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

```
Step 5 (ninja check 1) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
PASS: lit :: shtest-run-at-line.py (103028 of 103038)
PASS: lit :: lit-opts.py (103029 of 103038)
PASS: lit :: shtest-not.py (103030 of 103038)
PASS: lit :: xfail-cl.py (103031 of 103038)
PASS: lit :: diff-test-update.py (103032 of 103038)
PASS: lit :: discovery.py (103033 of 103038)
PASS: lit :: allow-retries.py (103034 of 103038)
PASS: LLVM :: tools/yaml2obj/ELF/DWARF/debug-aranges.yaml (103035 of 103038)
PASS: lit :: selecting.py (103036 of 103038)
PASS: lit :: shtest-shell.py (103037 of 103038)
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=2723.372980

```

</details>

https://github.com/llvm/llvm-project/pull/164096