[llvm] [MC] Fix MCLFI coding style. NFC (PR #228301)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-sie-ubuntu-fast` running on `sie-linux-worker` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/144/builds/67146

<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 'lit :: xfail-cl.py' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 3
env -u FILECHECK_OPTS "/usr/bin/python3.10" /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt'    --xfail-not 'true-xfail.txt;top-level-suite :: a :: test-xfail.txt'    Inputs/xfail-cl  | FileCheck --check-prefix=CHECK-FILTER /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# executed command: env -u FILECHECK_OPTS /usr/bin/python3.10 /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt' --xfail-not 'true-xfail.txt;top-level-suite :: a :: test-xfail.txt' Inputs/xfail-cl
# note: command had no output on stdout or stderr
# executed command: FileCheck --check-prefix=CHECK-FILTER /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# note: command had no output on stdout or stderr
# RUN: at line 8
env -u FILECHECK_OPTS "/usr/bin/python3.10" /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt'    --exclude-xfail    Inputs/xfail-cl  | FileCheck --check-prefixes=CHECK-EXCLUDED,CHECK-EXCLUDED-NOOVERRIDE /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# executed command: env -u FILECHECK_OPTS /usr/bin/python3.10 /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt' --exclude-xfail Inputs/xfail-cl
# note: command had no output on stdout or stderr
# executed command: FileCheck --check-prefixes=CHECK-EXCLUDED,CHECK-EXCLUDED-NOOVERRIDE /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# note: command had no output on stdout or stderr
# RUN: at line 13
env -u FILECHECK_OPTS "/usr/bin/python3.10" /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt'    --xfail-not 'true-xfail.txt'    --exclude-xfail    Inputs/xfail-cl  | FileCheck --check-prefixes=CHECK-EXCLUDED,CHECK-EXCLUDED-OVERRIDE /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# executed command: env -u FILECHECK_OPTS /usr/bin/python3.10 /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit.py -j1 -D use_normalized_slashes=0 --order=lexical --xfail 'false.txt;false2.txt;top-level-suite :: b :: test.txt' --xfail-not true-xfail.txt --exclude-xfail Inputs/xfail-cl
# .---command stderr------------
# | lit.py: /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/llvm-project/llvm/utils/lit/lit/TestTimes.py:29: fatal: found malformed timing data in '/home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/Inputs/xfail-cl/.lit_test_times.txt'; remove the file to regenerate it
# `-----------------------------
# error: command failed with exit status: 2
# executed command: FileCheck --check-prefixes=CHECK-EXCLUDED,CHECK-EXCLUDED-OVERRIDE /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  FileCheck --check-prefixes=CHECK-EXCLUDED,CHECK-EXCLUDED-OVERRIDE /home/buildbot/buildbot-root/llvm-clang-x86_64-sie-ubuntu-fast/build/utils/lit/tests/xfail-cl.py
# `-----------------------------
# error: command failed with exit status: 2

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/228301