[clang] [clang] SyntaxWarning: invalid escape sequence '\s' with Python3.12 (PR #78036)

[via cfe-commits]

================
@@ -6,6 +6,6 @@
 output_file = open(sys.argv[2], "w")
 
 for line in input_file:
-    m = re.search("^\s+(clang_[^;]+)", line)
+    m = re.search("^\\s+(clang_[^;]+)", line)
----------------
cor3ntin wrote:

```suggestion
    m = re.search(r"^\s+(clang_[^;]+)", line)
```

Making it a raw string is a marginally cleaner fix

https://github.com/llvm/llvm-project/pull/78036