[clang-tools-extra] [clang-tidy] Add an option to treat warnings as errors (PR #128221)

[Piotr Zegar via cfe-commits]

================
@@ -374,6 +379,8 @@ def main():
         common_clang_tidy_args.append("-extra-arg-before=%s" % arg)
     for plugin in args.plugins:
         common_clang_tidy_args.append("-load=%s" % plugin)
+    if args.warnings_as_errors != "":
----------------
PiotrZSL wrote:

probably this would be sufficient:
```suggestion
    if args.warnings_as_errors:
```

https://github.com/llvm/llvm-project/pull/128221
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