[clang] [clang-format] Add null-terminated path option (#123921) (PR #123926)

[Owen Pan via cfe-commits]

================
@@ -869,5 +876,12 @@ def convert_string(bytes_input):
         return str(bytes_input)
 
 
+def print_filename(filename, null=False):
+    if null:
+        print(filename + "\0", end="")
+    else:
+        print("    %s" % filename)
----------------
owenca wrote:

```suggestion
def print_filenames(filenames, print0=False):
    for filename in filenames:
        if print0:
            print(filename, end="\0")
        else:
            print(" " * 4 + filename)
```

https://github.com/llvm/llvm-project/pull/123926