[clang] [clang-tools-extra] [Clang] Default the warning for chained comparison to an error. (PR #128145)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-cmake-x86_64-avx512-linux` running on `avx512-intel64` while building `clang-tools-extra,clang` at step 13 "test-suite".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/133/builds/11692

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

```
Step 13 (test-suite) failure: test (failure)
...
size..interp: 28 
size..note.ABI-tag: 32 
size..note.gnu.property: 32 
size..plt: 64 
size..rela.dyn: 192 
size..rela.plt: 72 
size..rodata: 4 
size..text: 469 
**********
NOEXE: test-suite :: SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20180921-1.test (1230 of 2521)
******************** TEST 'test-suite :: SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20180921-1.test' FAILED ********************
Executable '/localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/test/sandbox/build/SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20180921-1' is missing
********************
PASS: test-suite :: SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20150611-1.test (1231 of 2521)
********** TEST 'test-suite :: SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20150611-1.test' RESULTS **********
compile_time: 0.0000 
exec_time: 0.0004 
hash: "33c0674fdb7ff53933d688c4e1550c4d" 
link_time: 0.0157 
size: 22848 
size..bss: 20 
size..comment: 154 
size..data: 4 
size..data.rel.ro: 8 
size..dynamic: 480 
size..dynstr: 136 
size..dynsym: 144 
size..eh_frame: 124 
size..eh_frame_hdr: 36 
size..fini: 13 
size..fini_array: 8 
size..gnu.build.attributes: 5004 
size..gnu.hash: 28 
size..gnu.version: 12 
size..gnu.version_r: 48 
size..got: 40 
size..got.plt: 32 
size..init: 27 
size..init_array: 8 
size..interp: 28 
size..note.ABI-tag: 32 
size..note.gnu.property: 32 
size..plt: 32 
size..rela.dyn: 192 
size..rela.plt: 24 
size..rodata: 4 
size..text: 367 
**********
PASS: test-suite :: SingleSource/Regression/C/gcc-c-torture/execute/GCC-C-execute-20170401-1.test (1232 of 2521)

```

</details>

https://github.com/llvm/llvm-project/pull/128145