[llvm] [BOLT] Create marker for source changes in nfc-mode testing. (PR #142931)

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``````````bash
darker --check --diff -r HEAD~1...HEAD bolt/utils/nfc-check-setup.py
``````````

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View the diff from darker here.
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``````````diff
--- nfc-check-setup.py	2025-06-05 08:11:16.000000 +0000
+++ nfc-check-setup.py	2025-06-05 09:01:42.217868 +0000
@@ -5,21 +5,33 @@
 import shlex
 import subprocess
 import sys
 import textwrap
 
+
 def get_relevant_bolt_changes(dir: str) -> str:
     # Return a list of bolt source changes that are relevant to tests.
     all_changes = subprocess.run(
-        shlex.split("git show HEAD --name-only --pretty=''"), cwd=dir,
-        text=True, stdout=subprocess.PIPE)
+        shlex.split("git show HEAD --name-only --pretty=''"),
+        cwd=dir,
+        text=True,
+        stdout=subprocess.PIPE,
+    )
     keep_bolt = subprocess.run(
-        shlex.split("grep '^bolt'"), input=all_changes.stdout,
-        text=True, stdout=subprocess.PIPE)
+        shlex.split("grep '^bolt'"),
+        input=all_changes.stdout,
+        text=True,
+        stdout=subprocess.PIPE,
+    )
     keep_relevant = subprocess.run(
-        shlex.split("grep -v -e '^bolt/docs' -e '^bolt/utils/docker' -e '^bolt/utils/dot2html'"),
-        input=keep_bolt.stdout, text=True, stdout=subprocess.PIPE)
+        shlex.split(
+            "grep -v -e '^bolt/docs' -e '^bolt/utils/docker' -e '^bolt/utils/dot2html'"
+        ),
+        input=keep_bolt.stdout,
+        text=True,
+        stdout=subprocess.PIPE,
+    )
     return keep_relevant.stdout
 
 def get_git_ref_or_rev(dir: str) -> str:
     # Run 'git symbolic-ref -q --short HEAD || git rev-parse --short HEAD'
     cmd_ref = "git symbolic-ref -q --short HEAD"
@@ -94,11 +106,11 @@
         if os.path.exists(marker):
             os.remove(marker)
         file_changes = get_relevant_bolt_changes(source_dir)
         # Create a marker file if any relevant BOLT source files changed.
         if len(file_changes) > 0:
-            print (f"BOLT source changes were found:\n{file_changes}")
+            print(f"BOLT source changes were found:\n{file_changes}")
             open(marker, "a").close()
 
     # determine whether a stash is needed
     stash = subprocess.run(
         shlex.split("git status --porcelain"),

``````````

</details>


https://github.com/llvm/llvm-project/pull/142931